After browsing the forum for getting on for a year, here's my first post!
We used to have a hot tub in our garden in England and loved it - but I wouldn't consider having one in a rental property as they are much harder to maintain than a pool, and the chances of nasty bugs like legionnaires are just too high!
If you are on-site to control it then they can be great fun - I'm even thinking of putting one in our house in the Algarve for when it's too cold to use the pool!