The "Freedom Yacht" line of boats is designed for your intended porpoise
They are designed from a scratch to sail singlehandly and they are perfect live-aboard boats. They have simple rig, plush interior, hot water, shower, and other niceties. Quite a few models made around a globe too.
Boats are not cheap, but they are low maintenance boats and build very well
There is a lady living aboard Freedom 30. She is active on Fleedomís e-mail list; you may try to talk to her.
FreedomOwnersGroup : Freedom Owners Group