This place is great!
Yes, you can hear a lot of noise from the street. Wasnt a problem for me because I was staying in november during a bunch of quarantine measures. So after midnigt it was quiet on the street.
Yes, there isnt any real shared space in the apartment but it wasnt a problem for me either. The few interactions I had with my neighbours went all well!
It is a nice and cosy room for one or two people to stay comfterable. It is located in a very central part of Madrid, so if you're gonna see a lot of Madrid then this is a great place to stay!
The host is a responsible, calm and very helpful.
I saw someone mention the showers being small, they are somewhat small but I liked them! There are two. I am a 180cm tall man and I didnt have a problem with them. I wouldnt recommend the showers to someone old though, might be tricky getting in there.