I used to love my roomba but while it does do an amazing job of what it does, I don't think they clean particularly large areas. It says they will do four rooms on one charge but it wouldn't do four rooms in my house very well - and none of them are particularly big. So I used to do hall and kitchen one day, hall and sitting room the next, hall and dining room, then hall and playroom. Then sometimes I'd remember to take it upstairs to do bedrooms.
After four years I don't use it much, we need a new battery so it doesn't last for long and it seems to get clogged up with hairs (just human hairs, no pets) and needs to be cleaned out every time I use it which is a faff.
The best bit is setting it to do the cleaning at 7am knowing. I'd come down to two hoovered rooms.