The apartment was really cozy and has everything you need. We didn't meet Yosi but his parents, who live in the house and were the loveliest people. They even made sure we always had fresh milk for a light breakfast they offer for free. The check in and communication were super smooth.
The apartment is located in Brighton and not exactly close to the Downtown. However you can reach it easily by bus and metro. Harvard and MIT are also easily reached by bus directly. Around there you can find many nice bars and restaurants. The 7 days Pass for Boston is definitely recommended tho. The Bus stop is 2 min from the apartment. The metro (green line) about a 10 min walk. We had a really great time at the Rosenbergs and would recommend it highly to everyone.