The building is quite old (I am not sure but it might have been the first YMCA in the US). Therefore you can't expect too much. Our room was small and very basic, but clean. However, it reminds more to a prison cell than to a hostel. If this doesn't matter because you do not plan to spend much time in the room it is OK.
The staff is very friendly and the location central enough to walk everywhere. Also you can take the subway.
You need to have a LAN-cable to access the internet. If you do not have it you can get it in a market across the street (8 $). With the cable the internet access is fast.
Important to know: No parking provided and parking in Boston is expensive!
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