Yes, and also asking things such as is it ok to pop in at anytime? If not, why not, because some places do prefer to keep mealtimes visitor free.
Ask about activities, and how they are personalised.
Can you go along on activity days to help?
Can your relative chose their bedtime, stay in their room if they want to, have safe, supervised access to the garden.
Are pets allowed?
Will they be able to attend church if they wish, and what are the arrangements for baths/showers, nailcare, hair washing and cuts.
Can they choose where to sit, and with whom, or sit away from others if they want to?
Ask to see a typical menu, and can they have coffee or tea, or another choice?
Can they have a newspaper delivered, and access to books?
Can they stay up until they wasn't to go to bed?