The unit we stayed in was extremely clean and we really enjoyed the seamless check-in since we did arrive late in the evening. The keyless doors and codes worked perfectly. Additionally, it was a well-kept space in all areas--including the shared bathroom for a decent price with a last-minute booking.
The only negative was the "knocking" apparently coming from the heater as it expands early in the morning (we are not from New England and were unfamiliar). It sounds as though someone is nailing/tapping to the wall in our unit. Luckily, we are relatively heavy sleepers and this was not that big of a deal. BUT...we would have liked to know this ahead of time or a disclaimer for those who are light sleepers.
Other than that issue, the block and unit as a whole were quiet in terms of human traffic and other noise.