The automobile license plates (number plates) in Maine (where I live) say "Vacationland" for good reason. Summer visitors or "summer complaints" as they are often referred to here, make up a sizeable portion of the state's economic income. There are many and I mean "MANY" summer vacation rental cottages, houses, camps, flats, etc. We know a lot of people who have such rental units, and several have offered advice in case we ever decide to set up a vacation let.
You have probably considered these suggestions already, but I'll toss them in anyway. One bit of advice was to make sure that the entire bathroom floor (including baseboards) is waterproof and that the floor is set up so that it drains off somehow, so that a bathroom flood won't saturate the rest of the house. Even with "good" renters, the bog may overflow or someone may accidentally leave the water running in the tub or lav. Another piece of advice was to require a VERY large refundable damage deposit (which is probably easier to do for higher-end rentals, I suppose). The third suggestion was to have whoever cleans and preps the place for the next renter take a few photographs for the record just before the next renter arrives.
As to bathroom (and kitchen) flooring, we've had really good luck with Marmoleum, which should wear like iron for decades if installed correctly.