We had a good stay at Marco's, who was there on time for the keys and was nice. Check out simple and good. The appartment was clean and well furnished, quite big with GOOD BEDDING in the rooms (I don't know about the sofa in the living room which seemed less comfy), nice view and access to the terrace on the top is great! San Lorenzo is studentish, with lots of pubs and restaurants. I love this part of the town which is however not for all.... so as climbing the stairs to the appartment (around 120) .
I can recommend this place if you are decently fit to have fun with the stairs and like comfortable beds and nice views