My husband and I just completed a 1 month stay:
Location - walking distance to tourist attractions, restaurants, grocery stores and bakeries. However, plenty of people made it clear the area was not safe to walk around at night.
Apartment - I really liked the apartment building. The building is secure and there is a concierge desk. I felt very safe there. However, if you are looking for perfect peace and quiet, be aware it is a noisy building where the neighbors make noise and play loud music.
The apartment is small, but sufficient for 1-2 people. For my husband and I, the size was not a problem for a 1 month stay. The apartment was mostly clean but some small stuff was missed.
Lastly, although Mary provided a fan and we had the patio doors open, the apartment can get hot during the day.
Communication - After we checked in, the communication was very good. I would send Mary a message and she would usually respond very quickly.
Overall, I would consider staying again.