The absolute best part of this place is it's location in Madrid. Restaurants, metro stations, and shops are easy to get to from this apartment. You won't need public transportation much as most of the tourist gathering places are within walking distance from the apartment. This is the biggest pro to the airbnb.
There are a few things that would be helpful to know before choosing this airbnb.
1. You need a separate key to access the front door which will get you into the building. From there you go up to the apartment which uses a different key. The front door of the building is difficult to open. It often took me a long time to get the lock and key to work together to open it. I was not given any information about how difficult it would be to open this door. Sometimes it took me a long time to get into the building. The key will eventually work but you need to know this is a process that takes time and patience.
2. No towels, soap, etc was provided. You need to either bring it or buy it once you get here. This wasn't a big problem but it would be helpful for future guests to know this.
3. There is one wall located beside the bed that is not in good condition. It has some discoloration and indentions.
While I was there, Jules (the host) was in France. It was possible to contact him, but it was a process. At points I had questions that were sent to him that he never answered. (I sent these both through the airbnb website and via text message) that he never answered.
I believe Jules will get better as an airbnb host after he hosts more people and gets constructive feed back. My review is not in anyway against him. Instead it is just to help renters know what they are getting and what they should expect. Jules seems like a good person and I believe he will continue to improve in his hosting skills.