I had my floors refinished before I moved in, but I think it’s possible (at least in theory) to get your floors refinished while you’re living in a place. I think my refinisher’s contract sheet said that they charged $75/hour to move furniture. Presumably you’ll need some space to move the furniture _to_. I don’t know if they’d charge extra on account of needing to spread the work out over 2 or more days so as to allow the given room(s) enough time for the floor to dry before moving furniture back in. Also, make sure they use low-VOC (volatile organic compounds) or no-VOC materials — if they use oil-based stains, etc., the fumes will be nasty and you won’t be able to get away from them.