Celma's apartment in Malasana is perfect to explore the city.
The neighbourhood feels safe, and the subway is just a short walk away, making travel to/from the airport easy. We were able to walk to Plaza Mayor in less than 10 minutes.
There are many bars and tapas restaurants in the area which were welcoming.
The flat is well equipped, clean and spacious.
Celma communicated with us in Spanish throughout our stay, which we were able to manage with basic Spanish language but is worth knowing. The listing suggests English as a spoken language, so if required this may have also been an option.
I would highly recommend Celma's apartment for a stay in Madrid.