First of all, I have to say that we enjoyed our stay and felt very happy to be so centric and have nearly no noise bothering at night. However there were a few things that I want to point out.
PRO's:
1. Very centric apartment that allows you to reach the most important sightseeing spots within 30 mins of walking radius.
2. The apartment is super quiet, even though it's located near Madrid's main road because it's pointing inwards and you will not hear a single sound of traffic at night. However, the machine for the Air Condition is directly located at the window to the bedroom which gives a permanent white noise during the hot season.
3. Everything was super clean and you will find all the kitchen appliances you need in case you want to cook.
4. The communication with the host was flawless and we got some help at our checkout where to leave the luggage.
5. The interior seems to be well done and the apartment has a very welcoming energy.
CON's:
1. The apartment seemed to be quite in use and the furniture was very old. Some parts are falling apart already and some appliances were coming off the wall. The window ok the bedroom could not be properly closed so the temperatures would could not drop so much as in the living room.
2. Sleeping in the Bedroom was a rather uncomfortable experience. The mattress was very stiff and the cushions very low so we woke up with quite some back and neck pain.
3. As quiet as the apartment was considering traffic and regular street noises, as much you could hear the neighbors talk and walk around at 5am in the morning.
All in all it was a really nice stay and we where happy we found this apartment. The Cons are really just complaining in a high level.