hi: CarolMN is right; if the teens wouldn't be comfortable sharing the sleeper, bring an air mattress. this is something we've done a few times. a full-size air mattress will make walking in the living room kind of tight when the bed is pulled out. another thing our youngest has done is to simply take the extra pillows from the sofabed as well as the chair pillows and make a mattress from that. the walk-in closet is almost large enough for a mattress too. you'll be spoiled with a 1br though, it's about twice as large as the studio. my dh refuses to stay in a studio any more.