The location next to the Duomo was very convenient and surprisingly quiet since the unit opens up to an interior courtyard. We especially liked the 2nd bathroom which made things easier in the mornings and evenings. Caroline was very flexible with our check-in time, allowing us to drop off our luggage around noon. While the cleaner finished up, we had lunch and the apartment was ready earlier than expected. There are a lot of doors (4 to be exact) from the street to the apartment, which means a lot of keys. The number of doors to unlock depends on the time, since access is via a shopping arcade below, which has typical business hours. Caroline provided excellent instructions though (with pictures) and we didn’t have any problems at all.
Overall, it’s a very nice setup. We noticed there is a 2nd unit managed by the same host behind the 3rd door. The two units share a common hallway, but again we had no problems with noise and did not notice our neighbors at all. I highly recommend Caroline’s place for your visit to Milan.