Diego's place was great. The location is perfect--walking distance to everything. There's a metro station right there as well. We had a little communication trouble with Diego upon arrival in Madrid. He didn't reply for a couple hours and we weren't able to do early check-in like discussed. (Not the biggest deal in the world) Once we did get in touch, everything was great. He was in contact with us each day during our stay checking in on us, making sure we had everything we needed.
The apartment is just as pictured, there's a super cute garden balcony that you have access to. Everything was clean and modern.
I would definitely recommend Diego's place to anyone visiting Madrid. We had a great experience. Thank you Diego!