I had a constant contact with the owners till the day we arrived.
The flat is well furnished and spacious for 4 people.
The appartment is very well located, in a little street (quiet) next to the metro station Tirso de Molina (10min walk to the Plaza Mayor).
We could visit Madrid in 3 days by foot (almost).

We were welcomed, had tips with a map and we were able to contact someone during our stay if needed.
We had a very pleasant stay in Madrid with the flat.