The apartment is lovely. Great decor, very comfortable and chic. Great central AC, great wifi for working. Super quiet area. Very comfortable king bed and a rainfall shower. All the appliances are new and work great. Great view from the small balcony of the mountains, faces west, so pretty spectacular sunsets. Jea is very responsible, kind, and accommodating!
Location is good if you are commuting to work near here. Otherwise it's a pretty long walk (10-20min) to any cafes, metros, restaurants, groceries, etc. It's about a 40-60 minute commute by metro to the main part of the city depending on where you are going and about 20 -30 min by cab. This is probably a better location choice if you have a car, but not if you are mostly walking/using metro to go into central Madrid.
Amenities were more mixed. Both pools are closed unless it's the summer months, but you can still access the rooftop and hang out in the lounge chairs and enjoy the views. The rooftop area also has a space you can work in, but there is no wifi, so you need to have a hotspot. The gym is pretty tiny, if 4-5 people are working out at the same time you have to be really careful and share the one set of light dumbbells. Mostly cardio machines and one multi-exercise weight machine. The Jacuzzi is mostly for the jets I assume as it's pretty cold/lukewarm water and you are not allowed to change the temp. It's set to 32 C but the highest it seems like it would even go is 36 C (96.8 F). The sauna is supposed to be turned off after every use which means it is also not hot. We turned it on and waited about an hour for it to heat up, but though the furnace was on, it never was able to get past 30 C. The paddle ball courts, park and outdoor gym area are really nice, elevators work great. There is also a game room on the first floor with foosball and pool (but it seemed like you needed to pay something for those so we didn't use them).