Mine are very similar, OP!
1 Bed. MIL has a small double. It's too small to share with DH comfortably - and along with this (1b) Own room. 😁I appreciate that it's princess like - but actually DH is a hideous snorer and I'm an insomniac. We have separate rooms at home, and I accept that staying with in-laws means sharing a room, but at least give us a KS bed or I really can't cope. Or twin singles, even.
2 Bleach in bathroom. MIL doesn't keep bleach in the bathroom. Not sure whether it's just under kitchen sink, but if I've had a poo I want to be able to put bleach down as I flush. I don't want to leave the room like that. (Tiny bathroom, tiny bungalow).
3 Food. Like yours, MIL appears to exist on thin air. At New Year when we went up there was awful 'diet' margarine spread in the fridge, 2 pints of milk and some blueberries. No bread in cupboards, no jam/biscuits/cake. I'm not sure what she eats. We were offered All Bran for breakfast. I didn't even know you could still buy it.
4 Lack of privacy. Despite knowing that I have a chronic condition MIL won't leave me alone if I've gone to lie down. Will come into the bedroom to say 'Do you want anything?' etc. Even if I am actually asleep. Has woken me up to ask me a question before. I feel quite vulnerable in bed, and I don't want someone else in there with me (apart from DH). It feels really intrusive.
I really just hate staying in other people's houses at all.