The location of the flat is amazing, very central and easy to get around by walking. There are some delicious restaurants within a short walk (and Maria provides a list of places she recommends). I stayed with my parents and it was helpful to have a lift so they didn't need to carry luggage up and down three flights of stairs. The apartment is also a good size for three people and would be beautiful with the terrace in summer. Maria was also very communicative when we had an issue opening the main door to the building.
The only issue was the noise on the street. Obviously Maria has no control over this, and it may just have been celebrations for Christmas as we stayed before and during Christmas, however there would be groups of men speaking loudly until 2 or 3am outside bars nearby. As the main bedroom faces the street, it resulted in my parents being unable to sleep until early in the morning a few nights in a row.