We were a couple having a short layover in Madrid for a night - we stayed on a Friday night, it is quite a busy street and noisy at night, so I would recommend some earplugs if you're a light sleeper.
We were let down with the arrival, we waited for an hour for the host to meet us even after we sms as soon as we landed in Madrid and called a few times (however the host apologized as they have misplaced the keys), communication could have been better.
When we booked, the photos of the listing was completely different from the apartment, we were told later that the apartment is newly renovated and photos will be updated soon (and has been now).
Regardless, it was still a nice, spacious, and very clean studio with basic amenities, the only thing that wasn't good was the shower/mini bathtub as it lacks a curtain and the water splashes out. The color decor was nice, bed was comfortable, and we really loved the classic Spanish-style balcony overlooking the street.
I would recommend this place for short stays - nothing beats the location, the studio was in a great location, 1 minute walk to Gran Via and all the shops, and a short stroll to the major attractions. The host was kind enough to allow us to leave our baggage at their office just a short stroll away after the check out time, which was really appreciated!