This is a fabulous apartment -- extremely spacious and in a great location. We stayed for 2 weeks with our 4 year old daughter and there was tons of space for us, her, and the toys she had brought! We cooked in the kitchen several nights, (as well as doing breakfast and many lunches in), and made use of the washer and dryer. The facilities were great for an extended stay. There is even a patio with table and chairs which we didn't use but could have.
The area is great -- very convenient to Back Bay and yet with its own South End character. We know Boston well (I'm from the area) but we enjoyed discovering some new restaurants -- there are several great ones within a block or two of the apartment -- and the local playground at the end of Dwight St (crucial if you have small children!)
Phil and Ann were away when we checked in, but Phil was available by phone to help with the check in (crucial since I had mis-recorded the entry code). When we had trouble with the wifi, he gave us an alternate network and password to join.
All in all this is a great place for an extended (or shorter) stay, with or without children. Thanks Phil and Ann.