The best solutions to any problems tend to be the simplest ones, of which cutting a hole in your floor and having to rig up a hoist most definitely isn't.
Those of us with multiple bikes will tend to find that one or two of them get used a lot more frequently than the others, for various reasons. The easy option is keep the less used bikes in the cellar out of the way, and have the most used ones upstairs where they are easy to get to. I don't have a cellar but I do have a tight staircase, and I keep a bike in a spare bedroom. When I want to move it, the front wheel is taken off. The bikes I use most often don't even live in the house. One is kept outside with a plastic bag over the saddle, another resides in the back of a van. Easy access, and if they get wet/muddy I'm not dripping muck all over my carpets indoors.