L.C.
Hi, I'm L., mother of Rose (4) and Leon (2). My husband and I took to the floor on Japanese futons years ago and love them so much-- and since the kids came we've just expanded up and out. We all sleep in a family bed together. The standard size mattress we use is slightly larger than a twin. We've got six of these mattresses. Two up and three across. They're super comfortable and when we have guests, we simply pull some off of our pile. They only cost about $120 each and come in Navy blue or black. Plus they fold up nicely into mini couches. We got them in Japantown at the little furniture/home accessory shop on the ground floor, street side on Sutter and Webster. Sorry forgot the name,but it's the only shop on that side (same as the Kabuki theatre side). As you enter it's right by the staircase and sticker booths. They aren't usually prominently displayed so you'll have to ask about them. Good luck!