We were met at the entrance to the building at the agreed time by Marga assistant. He helpful in explaining the apartment and how things worked. We are Americans from South Carolina and stayed in the Goya apartment for a week in early June. The apartment was far more than we expected. It is newly tastefully decorated with everything very new and functional. It is certainly the best location in city. You can walk easily to everything in old Madrid. This building has a modern functional elevator, rarely seen in this kind of apartment. While it was in the 90's every day we were there, the rooms remained cool and we used the AC in the bedroom only. The two AC units are like everything else very new and worked in the bedroom very well and I am sure would have been good in the living area. With the 2 balconies in the living area, the views are great of the local life and provides a nice cross ventilation. With the central location , you may get some noise with the activity, but all three balconies have two sets of shutters, plus a new (what else?) double glazed double patio doors. What little noise remained, we quickly adjusted to it.
Since we always travel with too much luggage, it was especially nice to have an elevator and when we left for home (sadly) there was a taxi right at the corner. Calle Montero is a walking street, but traffic crosses at Calle Aduana and since there are balconies on each street you don't miss anything. There is also an underground parking garage (Plaza Carmen) just one block away if you have car (not recommended). The police district office in 2 doors away and so there are no security concerns. We have stayed in a number of Airbnb apartments in Europe and this is one of the best. We give Marga 5 stars because we can't give her 6! Loved every minute of it.

Bob and Darle Booher