If you can before you take over book off two weeks holiday and do a proper hand over. There is nothing worse than the sale going through and you taking over and you are stood in the hall with your stuff and people are trying to check in and you have no idea who they are or what they are supposed to be paying. During the handover make sure the old owner shows you everything you can think of I will put a short list of vitals here.

Stop Cock for turning all the water off, the Gas meter, Water Meter, Electric Meter, Fuse Box, where they keep stock i.e. coffee sachets, sugar and milk for the rooms, the names of any suppliers e.g. the laundry, which day is bin day, which days do the laundry deliver, how much stock of sheets do they have in for the next week, any guests with special requirements who come regularly, how their booking system works and where are all the records. Who they bank with, a list of suppliers as these will all need to be notified of the change and so they can supply you with new account numbers and so on.