As long as you understand that this is someone's actual apartment and you're just using an empty room, you'll be alright. I really only used it as a place to sleep, so I can't say I have much to criticize.
However, he called me 3 times from 2 phones to make sure I left him a good review. It was very annoying and inappropriate. For that reason, I won't be staying with him again. However, I had no qualms with the time I spent there.