The apartment is just as it looks in photos; it is cute, clean, and comfortable. Billy responds very quickly to messages. Location is at the edge of Chinatown, and a 10-15 minute walk in multiple directions will get you to restaurants, shopping, etc. It's also pretty easy for Uber to find. There is a keypad lock on the outside door, as well as the apartment door, so you should feel safe, and you don't have to worry about keeping up with a key.
A few things to be aware of: the apartment is located in a multi-unit building in a busy part of the city, so there can be a bit of noise. Also, the stairwell is narrow and a bit steep; I would not recommend for anyone with mobility issues (elderly, handicapped, etc). Otherwise, it is a great place, and a good deal in Boston!