My daughter and I had an overall pleasant stay at Arnaldo's apartment. The communication was very clear and entering the apartment was easy. It is located in a quite area, away from the noise you can get in areas such as Sol, but the access to the next metro station is only 10 minutes away on foot, which is great.
The apartment is clean and the beds are comfortable. The bathroom is clean but the shower gets blocked quite quickly - the water doesn't drain fast enough and you end up putting water everywhere.
The kitchen could do with more cutlery and crockery: mugs for those who want tea (there are only 2 small glass cups), a pair of scissors (you can't take them on the plane, so it would be useful to have some in the apartment), a tin opener, a bottle opener and a corkscrew.
We would recommend staying in Arnaldo's apartment providing the little improvements mentioned above are made. Finally, a slight word of warning, which of course isn't Arnaldo's fault: the apartment is situated on the 8th floor of the building and there are 2 lifts. Unfortunately, they seem to get stuck quite often, so be prepared to take the stairs.