This was for us a very nice stay in all respects. The flat, while not huge, had everything we needed, from wifi to cooking utensils, so we didn’t have to worry about anything, which matters when travelling with a large family. The third floor was not a problem for us, but there was a lift anyway.
The cleanliness of the flat was impressive : when we arrived, everything felt fresh and well looked-after.
Our host was very helpful to us both before and during our stay.
The flat was within walking distance of some pretty useful metro stations, on lines 1 and 2. We also took the bus for variety, which was easy as Cuatro Caminos seems to be a transport hub. The area is pretty dense and rather nondescript, without any tourist attractions but but with all the shops we needed. So all in all we thought it was a great place to stay, for a very fair price.