This is a very nice apartment located on a street that is quiet yet also just a short walk of a few blocks to the trendy areas of Palermo Soho, such as Plaza Serrano. There is a supermarket nearby, and many fruit stalls. Graciela and I communicated very well over Airbnb messages despite our language barrier. Graciela gave us two sets of keys to the apartment as well as front door of the building. As there is a key to the building as well, it feels very safe.
The only tip I have for other guests is to make sure that you have the building number on Malabia, and the mobile number of Graciela. The building (or street) number somehow doesn't seem to be clear on the listing, but it does appear if you click on the address to map it on your phone. We had no problem, but it is conceivable that you might not immediately find these information when you need it.
Overall, a great place to stay in Palermo Soho and excellent value.