It was great! Even though I booked only two days in advance and Alfonos wasn't there himself he managed to get my room ready in time. The appartment is super central, 3 min from Jardin de Principe de Anglona which is a little jewel of quietness in the buzzling city of Madrid. Sol is 10-15 minute footwalk and from there you get everywhere.
The room was super clean and tidy, small with a bed and a little desk and not the lightest as the window goes to the ventilation shaft but it's calm and chill. The bathroom is super nice even with a massaging and rainshower and Alfonso was very responsive to a bathroom problem that had arised before I was there but was fixed within 24h.
I can totally recommend him, his appartment and will definitely come back when I come to Madrid again looking for an Airbnb.