You are right in the heart of Beacon Hill with this place -- close proximity to lots of great restaurants, parks, grocery stores, etc. The pre-trip and during trip communication with the host was outstanding and very timely.
Because you are right in the thick of things, you should expect some street/city noises (traffic, sirens from nearby hospital and fire department, etc).
It's a cozy place that has all the basics you'll need for your stay in Boston!