One thing that made me extremely uncomfortable at Nico's place was that he entered my room while i was gone WITHOUT my permission to take an iron he had given me the day before. He only sent me a message afterwards to let me know he already entered to take it. It felt very intrusive because i wasn't even consulted and it felt unsafe, as i had my belongings out.
I would have left the iron outside the room if he said he wants to use it, or he could've sent me a message prior to taking the decision to enter my room to ask for permission. 1) This completely violates the "private room" aspect of Airbnb. 2) With payment for a room, you expect privacy of your space and belongings. This is not a hotel where you expect admission to your room without permission. 3) I am an airbnb host myself in Madrid and i would NEVER enter a guest's place without their permission, unless they want me to, or unless it is an emergency. There was no emergency in this case, and i wasn't breaking any rules. So please whoever is reading this, if you care about this point, make sure to discuss it with the host before arrival.
Another thing, the phone number he specified on his listing is wrong, which made the check-in process even harder after such a long delay on his part because of traffic.
On the other hand, the place is clean and well connected.