One apartment
One apartment, one shut-in, and a whole day that has to be filled with something. No plans, no obligations — just quiet domestic life behind drawn curtains.
The hero has five needs: energy, sleep, hygiene, the toilet, and play. All of them drain on their own, and all of them have to be kept up. Eat, get some sleep, take a shower, make it to the toilet in time, sit down at the computer — that's what a day is made of.