Actually, replacing a bilge pump is considerably easier than changing the oil...
We are usually just the two of us on the boat, but my daughter and her husband live in England, so when they visit, they tend to be here for a good period of time.
We wanted a boat that was comfortable for the two of us, but big enough for two couples for at least a couple of weeks. So far, our longest time aboard with two couples has been 10 days. It was fine. It's probably worth considering that we all like one another...
Beneteau 423 #310