Paula's apartment is very central and great place to explore Madrid from. The check-in process was easy with Paula's husband meeting us at the door and helping us with our luggage up to the unit. The space is small but very nicely laid out with all the necessities in place to call the apartment home while there.
As noted in other reviews, the weekend street-noise can make its way through the windows and wooden shutters when closed. And the building's access door can startle you a few times at night, but otherwise, a great place to explore the "Las Letras" neighborhood from.