We stayed over three weeks at Martino's and were very happy there. The place is immaculate and gorgeous - newly redone, high ceilings and huge doors that open to a balcony. The air and the light in the place was fantastic. Beds were very comfortable and the shower was really good and big by Italian standards.
Neighborhood is great - we wanted to be outside of the old town because parking is hard there and most apartments are dark. That said we were a ten minute stroll away through the main piazza, and close to shops, restaurants and everything. Parking was pretty easy - depending on time of day we could usually park out front.
Martino is a wonderful host, always available even when I locked us out one night, and super knowledgeable about the city having grown up there and being a certified tour guide.
We will definitely make this our home base when we come back to Monopoli.