Don't book this place. Just go to a hostel, you will be 100x more comfortable, even in the cheapest hostel.
First of all this "bedroom" is a space at the back of the kitchen. It is connected to the kitchen, only separated by some kind of a wooden partition, not even a real door. So you are sleeping in somebody's kitchen, without any sound, smell or heat isolation. The kitchen starts to be used at 6am every day, so you can hear the sound of chopping like 40 cm away from your bed. I used earplugs which helped with the basic noise, but one of the other tenants in the house starts having EXTREMELY LOUD conversations on the phone in the kitchen at around 8 am and pretty much never stops throughout the day. I was woken up every singly day by loud screaming on the phone despite earplugs.
During the time I stayed in Madrid, some nights it was 2C degrees outside and the house was so cold, it must have been bearly 10C degrees inside. I had to sleep in sweaters. It was also made worse by the fact that the kitchen has an open balcony, so you can literally feel the wind blowing from there through the room.
All of this would have been somehow tolerable if the host Mayra did no lie to me and rip me off. I asked her if she would refund me if I check out a bit earlier, she said ok, then after I checked out, she started lying, and long story short, I was charged after I checked out and Mayra never returned my money.
I also had a really nasty incident with the hosts. Mayra's mother asked for my ID, and when I showed it to her she started taking photos of it. I asked her why she needs photos, she told me she is taking photos so that she can see the passport number better. (???) I felt extremely uncomfortable with giving somebody the photo of my ID and with the explanation that she gave, so I asked her to delete it. She said ok, but immediately sent the photos to somebody on Whatsapp, thinking I was not looking.
So unless you want to waste your time, money, energy, get chronic insomnia, and get lied to and tricked, stay away from this place.