I have a 75 in the living room. Soon a 30 with a 20L below it(currently in the kitchen) will be next to the family computer desk, also in the living room. I also have a 5 in the kitchen. The 58 and 10 at my husbands office (not tectonically at home, but i still have to do water changes weekly!)
All of mine (at home) are within a python's distance from the bathroom, and visually if you stand on the carpet between the living room and the vinyl of the kitchen/dinning room, you can see all 4. So far, this is where we spend all our time, so this is where i want all the tanks. Once our family grows and we start using the basement, i have picked out a corner that would be perfect for a fish room!