I live in a very small condo and lease half a barn 9 miles away.

1 in the dining room, two in the living room, building a rack soon for all three and shelf space on the living room.

3 more out at the barn. Bikes do not live outside except during the day at work. When I refurbished the GFs bike I told her that when I was done it was an inside bike and will never spend the night outside again.

for those who first thinking about bikes inside I have a few hallway rugs up against the walls under the bikes. Cheap, easy to clean. As a bachelor I dont much care about interior style.