We're liveaboard cruising on a 40 Ocean. Details and some pix of the boat here:
https://sdfjkl.org/songbird/That's two of us, with very occasional visitors. When there's no visitors, the forward cabin has the cushions up and is used as extra storage/shed, which you'll find is normal on cruising boats. I'm very glad it only has one heads by the way, although if I had ended up with a boat with two, I would've ripped one out and fitted a washing machine there. We've got a portable washing machine in the stbd lazarette instead, works too but you have to lift it out every time.
Storage is actually not bad (but never enough). The entire portside settee is available and also the forward half of the starboard side. There's a huge cavernous space under the V-berth, aft of the second water tank. And a PO added some shelving to the engine room on which we keep spares and tools. There's good stowage in the galley for food and we use the nearest section of the portside settee for additional food stores. As the bilge is dry, heavy items are stored there - canned food and beer is under the galley floor, milk, wine and emergency water bottles under the saloon table, etc. - there is plenty of room overall.
We're quite happy with the boat, although I would love to have an extra cabin for a workshop, but then that was never going to happen on a 40 footer. One German 40 Ocean that circumnavigated had a funny progression of the forward cabin over the years: from chomping off a bit on the side for more tool/part storage but keeping the beds to a fully fledged workbench and no more sleeping area - priorities change and as you go further afield, visitors will become rarer and the onboard workshop more important!
On Songbird I've added a stern arch on the back with 600W solar on top, which is excellent and covers all our needs, including power for the recently installed watermaker. It's also an excellent place for shoreline and stern anchor reels, mounting antennas and hanging the fruit net. In hindsight, I would've liked some davits to make the dinghy more quickly accessible and less tedious to stow for passage.
The engine room access is indeed superb and every time I help someone on another boat where you have to twist one arm through a narrow hole where you can't possibly apply any force on anything (e.g. for pulling a hose off), I happily go back to mine afterwards and think what a good choice I've made