Andrea is an amazing host who knows his city very well. We weren't even able to visit all the places he recommended in the neighborhood. San Lorenzo is a nice hip area but walking to the flat at night can be a little annoying because you have to pass some dark corners around Termini station so I would follow his advice and take a cab. The apartment itself is really nice and cormfortable with vintage furniture and small but clean rooms. The mattress was pretty firm (which is good) and he even offered Breakfast. If you go to Rome stay at Andrea's place which might be a little away from all the touristic sights but is surrounded by a lot of nightlife spots (Bars, Restaurants) in San Lorenzo and Pigneto so your way to bed is a short one. Highly recommended. Would definitely stay there again myself