After two weeks I must say: five Star Air BnB, awesome house and host: very clean, nice design, a lot of details, easy communicaction with Jonathan. You always meet nice and interesting guests in his house. Safe area, walking distance to Longwood Hospital area (20 min), 35 min to the BSO, with Blue Bikes you can explore the city easily (don´t forget helmet!). Supermarkets not so close (15-20 min). For me the best place in Boston, also ideal for longer stay.