Maria quickly responded to any questions I had before the start of the stay, and the key hand-over was smooth. The flat is in a great location, near the main tourist sites, but is on a courtyard rather than overlooking the street and we couldn't believe how quiet it was. There are a number of nice cafes and restaurants nearby. The flat had everything we needed and was really warm over a chilly few days.
As other reviews have mentioned, the flat is on the third floor and there is no lift. If you have lots of luggage or a child's buggy it could be tricky. But my children (5 and 7 years old) had no problem at all.