@Laura2592 Serving the homestay crowd, I've been impressed by how many guests were perfectly happy to share a bed with a parent, sibling, or platonic friend. I've hosted every imaginable combination of genders and ages in all three dynamics, and surprisingly, never got even a whisper of discomfort in their feedback. I'm sure all of these visitors lived comfortable lives with their own beds at home, but they came to Berlin for a few days of la vie de Bohème, or they'd rather spend their budgets on dining and entertainment than on the place they go to sleep.
If I were offering a one-bedroom home for short stays (< 5 days) to budget travelers, I'd set the max occupancy at 3. Four is too much - even if the sofabed could technically fit 2, the space gets too cluttered with people's stuff and it no longer works as a living room.
If I were doing longer rentals, or aiming for the luxury market, I'd cap it at 2. Not sure I'd even offer a sofabed - it's lovely to have one when staying with friends or relatives, but if you're splitting the cost of accommodation with your traveling partners, it's the fuzzy end of the lollipop.
Oh, and if I were running the White Lotus, I wouldn't have let the Mossbachers bring three teenagers into a one-bedroom suite. Everyone who's ever worked in a 5-star knew minutes into the first episode that they'd wind up with a refund, even though none could have predicted why...