We did not enjoy our stay at Renan's flat.
First, the positives: the location and is good for those looking to explore Madrid's best attractions.
Now the negatives: to begin with Renan was not at all accommodating when we arrived. We informed him that we did not have a mobile as it is very expensive coming from Canada, but that we would be arriving by train at a specific time. We messaged from the train station, right on time, and informed him that we would be at the flat within 20 minutes. We were there within 10 and waited for quite a while, but no one met us. Eventually we checked our messages to find Renan's response of "call when you at flat". We called him at great expense. 10 minutes later another person met us to let us in but spoke no English. For any problems we were told "call renan".
The pictures are not representative of the flat. The bedroom is quite large, but the flat is very old, despite the "fresh" look in the pictures.
There were insects everywhere. All over the kitchen, bathroom, and bedroom. Especially in the kitchen. We were afraid to keep food in the kitchen, and it didn't help that the fridge was not cleaned.
The shower drain did not work. You could use the shower but after 90 seconds it would overflow. We notified Renan of this problem and the next day he sent a plumber (read: neighbour with a plunger). The plunger did nothing and when we again notified Renan of the problem the response was "ok sorry".
Noise: the street noise was not an issue. What is an issue is the paper thin walls. You are living inside your neighbours flat as well. Whether it is a baby crying, toilet flushing, or conversation, it is very loud. We managed to sleep using a white noise app.
The flat was not clean and overall we were pretty uncomfortable.