Overall, the apartment was great! We were very comfortable and the location was perfect. It was very close to Gran Via and there were many nice cafes/restaurants/shops in the vicinity.

Since we didn't have any international cell service (coming from the states), we used free wifi at the airport to text Renan that we had arrived and then tracked down a payphone (there's one less than a block away) once we were at the apartment to let him know we were at the apartment. He answered after a few rings and someone met us at the door within 2 minutes. No problems! Just as an FYI--it's all one-way streets around the apartment and it was tricky for the cab driver to get to the apartment. He ended up dropping us a few streets over. This could have just been our cab driver, but it's probably best to bring or study a map before arrival if you don't have data on your phone.

As some other people said, Renan left us a nice starter kit of some cokes, water, and wine--a really nice gesture! Also as reported, we did struggle with the outside door lock the first few times until we got the hang of it. One set of keys simply would not work for us, but we only needed to angle the key on the other set upwards to get the lock to work for us.

It was a little noisy at night, particularly on the weekend. I'm a pretty heavy sleeper, but ended up wearing earplugs so as not to be disturbed.

I would definitely stay there again and recommend it to anyone traveling to Madrid!