This was our first time going to Madrid, and I can easily say that we couldn't have had a more comfortable stay in an apartment like we did in Milagros & Raul's apartment.
First of all, the location is amazing. It's very close to the city center, and it's in the middle of the local population. There are some great restaurants nearby, and the neighbourhood has a lot of activity.
The apartment itself was very clean and very modern. We had no issues with heat, as there was airconditioning or a fan available in every room. Also plenty of bathrooms, so everyone could get ready on their own pace.
The hosts were also very responsive to all our messages, and gave us plenty of directions, so no issues with that either. Once we checked into our apartment, we were left privately and alone, which was another plus.
I would definitely recommend this place, and I would definitely book this apartment again if I were ever to go back to Madrid.