This is literally steps from the Old North Church, part of the Freedom Trail. The Location could not be better. Right in the heart of the North End but not on a noisy street. Our host was wonderful with communication - clear instructions for check in and easy to get hold of with questions. Small apartment with separate bedroom and living area. Clean and comfortable.
Only caveat is that the floors squeak and the walls are somewhat thin. Could hear the neighbors coming and going. This was in no way a problem, but if you are dedicated to quiet space, maybe you keep looking.
I would DEFINITELY book again if (when?) I return to Boston.