I stayed in Rosalia's apartment for two nights alone. It is exactly as pictured, the description and the previous reviews accurately describe the apartment. It is perfect for one person or a couple. The bed is comfortable and the kitchen/ living space, though small was cozy. I was able to get work done and enjoy the space. The windows are great- really help to make the place feel bigger and homey. The blackout blinds are great in the bed area.
As mentioned in other reviews there is street traffic and that noise does make it into the room. It is not a huge deal, part of being in the 'centro' of a major city. If noise is an issue for you I would bring earplugs.
Location- great spot. Easy walking to about everything and the place is right in front of a metro bus. It is just a block away from cafes and restaurants. The street is safe day and night. 24-hour security at the front desk. Superb location.
Communication- easy and fast. Rosalia does it right.