A condo would be good, or anything you can do for their entertainment, but it really shouldn't be a problem. When I first moved to Chicago, all I could afford was a really small one bedroom apartment. I basically had the bedroom and one other room that I turned into a living room with a stove and refrigerator in it (no kitchen or dining room table). Tubby and Peanut moved in - both coming from my mom's big house in the country with a woods out the backdoor. Quite a change for all of us.
Tubby and Peanut did just fine. I was at work all day, and went out frequently at night so not only were they confined to a much smaller space, but they didn't have any company around most of the time either. But they never complained or got stressed out. I had two big windows that looked down on a busy street, so that kept them entertained.
The only time there was a problem was one time I was heading out to do my laundry. My hands were full with the laundry basket and there was an automatic door closer on the door - and it was powerfull. Tubby normally didn't bolt out the door, but this time he did and I didn't see him. He was quick, but not quite quick enough and the door slammed on his tail! I just about had a heart attack when he screached then took off down the hall. Dropping the laundry basket I ran after him and finally got him before he got on the elevator - whew! I felt so bad. It only got the tip of his tail so it didn't break it or anything, but the tip was really sore and a little swollen for a few weeks. He never did like it when I touched his tail, and he liked it even less after this. The one good thing that came from it was that he never tried to sneak out the door again after that. I always did think he was a smart one.
Anyway, if you provide entertainment and company for them, I really don't think you'll have a problem. The good news is you now have two of them, so they can keep each other company.
Good luck and let us know how it goes.
Spring 1986 - Dec. 11, 2004
RIP Big Boy
Fall 1988 - Jan. 24, 2007
RIP Snotty Girl
Fall 1997 - Oct. 6, 2012
RIP Sweet Monkeyhead Girl