in a bedroom, not a living room.  How many kids/ages do you have? 

Triple bunk beds?! Are there 6 of them?

if so you have larger issues than beds. 

It's always best to make your SK's feel like home even when they're not with their custodial parent. When they visit, it will make them happier and more comfortable having their own bed, clothes and toys there. Even if that room(s) aren't used other than when they're visiting, it'll make them feel more secure knowing they're not guests at that house but that it's a second home for them. That sense of security will help them grow to love and appreciate both parents and step parents and will give them a much healthier mindset as they grow older which results in a more successful life and stronger relationship building.

Each child should have their own bed at the very least. If it's possible to have their own room then that's great but I understand not wanting to give a full room that will be empty the majority of the time. However in this case 3 to a room is already a bit intense and they shouldn't all have to share one room even if they are only there a few times a month.

My SO has two. When they were little they did share a futon but as soon as we had space we got bunk beds. We also use their room for guest when they aren't with us or if we both want to watch TV we can.

I'm going to be blunt with you:

You don't live there. You don't pay for it. You haven't been asked to move in. Therefore, it's not your concern until it's your money and your space.

There are 6 kids who each need a bed to themselves. Unless he is going to get 6 rollaway beds that will take up on entire room just in storage, he's going to have to purchase 6 actual beds that will take up both rooms. At 900 sq ft, that's his only option unless the only "common area" is his bedroom.

This is one of those things where you don't get to make suggestions or offer opinions. This is an exercise in observation and reflection. The question isn't "should my BF give up his 2 bedrooms to the kids?" It should be "if I am ever asked to move in, could I live with this arrangement, and if I can't, is this the relationship for me?"

Better to ask that question NOW than when your lease is up and you don't have time to make othet arrangements.

If the kids will all be there at the same time?  then they should each have their own bed.  

Now.. he could buy two bunk beds and then have a trundle that rolls out at night.  that would work.. and it would free up floor space.  

I don't think his plans are loony.. I mean.. he already HAS the kids.. he just needs to figure out how to have a place for them to sleep.  6 kids in 2 rooms is not ideal.. but look at the brady bunch set up.. it used to not be as unusual for multiple siblings to share rooms.. my dad shared a room with 3 other boys.

But.. yeah.. when the time comes.. can YOU live in a 900 sq foot space with 7 other people?  will it allow for future space for any more?

You have to face facts.. with 6 kids.. he is not a candidate for you if you want more/any kids.. there is no way he has the resources to do more than that. so if that's a priority.. find someone less encumbered. 

Unless his kids are exceptional specimens and you love spending time with them? no.. this will never work for you.

but as has been pointed out.  this is not your apt.  you aren't paying his bills and you are not a parent to his kids.. it really isn't your place to put requirements.. but it is telling if he is creating a home.. with no room for you.

Why oh why oh why do you even care about this stuff? There are over 12 million males in the NYC metro area. Find a few without all the baggage and dysfunction that comes with this guy, date them, and have a better life.

How many bathrooms in the Apt?

Why didn’t he think all this through before he produced 6 kids? One needs a large house and very good salary to support and house 6 kids. Now he crams them all in two rooms and can’t afford anything. I’d not want a guy who is that irresponsible. Why not look for a single guy? 

I imagine when you have 6 kids everything is expensive. I can’t imagine walking into that situation and thinking that I would want to add one or two more kids to that mix in the future. Wow...groceries alone must be insanely expensive even just for the weekends they are with you. 

two portapotties out back and several Murphy beds.

RUN fot your LIFE!!! (literally)

Him becoming full time parent.  It's only one BM accident away.  BM not being able to handle them. Or she finds a new boy toy.   Two as kids get older they get more expensive.  School trips,  cars. Car insurance, college, weddings.  I can see unless he has a great job,  what he does not have or we would not be in a two bedroom apartment.  How he's going to afford all of this.  And adding us kids on top of all of it