Highly recommended.
I have spent more than 2 months here and felt very much at home the whole time.
Everything you need is there, and San Marco is a really beautiful small village.
Nearby, just across the piazza, there's a nice bar, a pharmacy, a post office, a mini market.
The whole place is a bit like Alberobello, but more authentic and less touristy.
Marisa and Francesco are wonderful hosts, who replied within minutes to all my questions.