We have one like the ebay linked one. We’re fortunate to have an alcove in the hallway that is about the length of a bike, so it goes in there. Stand keeps one bike up high, then rather than hang, we pack in three bikes below (two belong to the Mrs and they don’t get used as much). An old rug in that space means any chain oil, stray mud, etc doesn’t get on the carpet, and we have a long rubber-backed hallway mat from ikea that leads from the front door to it.
I have a dirtworker/nomad 12v cleaner which goes in the car if I’m taking the MTB, wash off before putting in the car, it’s dry by the time I get home. Use the bath occasionally for more thorough cleans. If I was riding from home, I’d stick the washer in the car, and wash bike outside before bringing in. Big Ikea bags for bringing dirty kit back inside.
Riding kit and tools/spares are in plastic crates above the wardrobe.
For maintenance, I have an old duvet cover I can put down in the lounge and work away on.
You do need to be brutal about what you “need”, in terms of bikes and spares. Replace some wheels and you may not have the luxury of space to keep them “just in case”.