A unique apartment that used to be a shop, it's right next to a tattoo shop. It affords a lot of privacy, though it is right by an extraordinarily busy street. Hey, you're in the heart of Madrid, and it's filled with travelers and partiers pretty much 24/7, that's what you are coming for yourself, right?
The place is very clean, and well-priced, with a location most will find perfect; it's located right by Coffee and Kicks which is highly recommended for coffee, for example.
I do wish it had a dryer so that laundry was possible in the unit, I am not sure what you can do with only a washer...maybe others would be open laying out their wet laundry to dry in the apartment, I don't know. In any case, there is a laundromat nearby at least.
The apartment is also a loft more than a 1-bedroom, as there is no door closing off the bedroom from the living room/kitchen although there is a closet barrier. I don't know if this would bother anyone, it wasn't an issue for me, but for some people maybe they would be interested in this detail.
Another possible thing some people might care about is that the apartment has no view to the street; the windows are coated in a white film that gives no outside view. This is interesting, but ultimately I am unsure of the purpose of this because the film is light enough that it lets the sunlight inside, so I guess it is just about extra privacy. Either way, no one from the street could see you in the bedroom area, though. Some people may enjoy this extra privacy, others may view the listing thinking that there is an available street view somewhere and find it a little disorienting that there isn't one.
Finally, I will note that the bed they have is very firm. If you aren't a fan of extra-firm mattresses, I might be wary of this. I was able to be ok by using the extra blanket over the mattress which was quite fluffy and clean, but maybe others would be more bothered by this, I don't know, but it's a useful detail.
Overall, I think it's quite spacious, incredibly clean, centrally located, and priced really well in the Madrid marketplace.