We stayed in the apartment 10 nights. The bottom line is that we highly recommend the apartment. If we return to Madrid we will probably take it again and we will recommend it to our friends. Below are some details:
1. We stayed in apartment 8A (Alberto has at least one more apartment on the floor)
2. Location is perfect. Short distance to all of the main tourist attractions, the apartment's nearby streets are safe to walk until late in the evening.
3. Noise - not an issue. We regularly leave in a quiet village and we felt no problem.
4. Utilities - All was working fine. Electrical appliances such as the washing machine, dish washer and espresso machine were working perfectly.
5. Communications - Alberto was available all the time in Whatsapp. We did not have any issues but for every question we got a quick answer.
6. Two things to consider:
6.1 The elevator reaches floor 7 and then you need to go by stairs to the 8th floor. For us (and for most people) this is a non-issue but if you have limited mobility, this should be considered.
6.2 The apartment is below the roof and has a sloping ceiling (I hope this is the right English expression). As relatively tall people, we banged our heads in the ceiling from time to time. This was a bit inconvenient.