I stayed for 3 weeks in October and overall it was a very positive experience. The location is amazing just off Gran Via and most attractions are within a 20 minute walk. There's some street noise if the balcony is open (as expected from a city), but I was surprised by how quiet the apartment was in general. It also felt very safe. The internet is fast, the AC works great, and there were no issues with the TVs (although only the bedroom TV has apps). Enrique was very helpful and communicative. Even when my flight was delayed he still met me in person at the apartment with wine, chocolate, and apples. The space is quite large and could easily accommodate multiple guests. I recommend staying here.
Enrique's place does have some quirks though. There are no instructions for the amenities. The washer/dryer took a lot of trial and error even after finding a manual online, and most cycles ended with extremely wrinkled or shrunk clothing. We never got the stove to work, even with Enrique's help. The water in the apartment gets hot enough to seriously cause burns, so be careful. Perhaps it was just the time of year, but the apartment was quite dry and there was no humidifier (at least that I could find). Finally, the apartment has cameras (visible in the listing's photos) which are deactivated. I know this complies with policy, but it's not very comforting having cameras pointed at you.
Lastly, a few tips! The nearby Dia is great for a quick grocery run, but there's also a 24/7 Carrefour just a block further. The elevator is a bit small (barely fits 2 adults comfortably) so if you're traveling with lots of luggage just keep that in mind. If you use ride apps like Uber, there's nowhere in front of the apartment for a car to stop and wait, so either call one after you get outside or walk to Gran Via first. However, most places can be easily walked to, and overall the area felt very safe to walk around even late at night. And finally, if you love pizza, check out Lopez & Lopez nearby.