Love! Love! Love!
I rented this flat for my parents week long vacation in Madrid. The apartment is lovely and exactly as pictured. Very bright and open but with blackout doors and AC for the hot afternoons. The flat is in the very center of the city so we didn't use public transportation at all during their visit.
The landlord was great and very accommodating. He even left a nice bottle of red wine and potato chips as a welcome gift.
The only thing you might want to consider is the size of the kitchen. While it is on the small side, we were still able to make it work for hosting 4 additional people (7 total) for dinner one evening.
All in all, I give this apartment a 10/10 and definitely recommend it to anyone visiting madrid!