I did not stay in the place that I reserved, and I was not notified about this change until the morning of check-in. On the plus side, the new place was larger spot in Beacon Hill. On the down side, I specifically booked in Somerville because I was in town for business that I wanted to be able to walk to and from.
If you're seeking to stay in Beacon Hill, the apartment is in a great location that's a short walk to T stop and the Freedom Trail. Use extra caution navigating the steeps stairs in and out of the apartment and the narrow spiral staircase heading to the downstairs bedrooms.