Ana was very friendly and has welcome us at our arrival (being flexible on checkin time for us which allowed us to drop our bags and enjoy the city straight away).
The flat is ideally located right in the heart of Madrid lively old neighbourhood and you can walk from there without using the tube which is fantastic.
There is a lot of traffic yet the double glazed windows are really working great reducing the outside noise level to a minimum.

On the less positive note:
The flat is located in an old building with extremely thin walls which means you will hear conversations, singing and flushing/showers from the neighbours (sometime until very late in the night).
The flat was clean when we arrived but unfortunately most of the dishes had been left dirty in the cupboard - probably from previous hosts...
Despite these small hiccups we really enjoyed our stay in the city!