I recently set up the following schedule, which is working out well:
Mon: pick up apartment and vacuum
Tues: wash dishes
Wed: pick up apartment and vacuum
Thurs: wash dishes
Sun: clean bathroom
These are just the musts, of course. If I feel like doing more one day, or feel like doing dishes on a day off, then even better. But this is the minimum, to keep things from getting out of control. We don't have a set laundry day, though.