This apartment is a sub-unit inside of the larger duplex apartment that is Helena's apartment. Helena was able to accommodate my reservation on short notice, for which I am grateful. She explained how everything worked to me, particularly the keys with the doors, which can be a little tricky.
The apartment is clean, quiet, and centrally located in the Barrio de Las Letras, but be aware that it is very basic. There is a bedroom, bathroom (with tub), and a small sitting room. In the sitting room, there is a mini-fridge, hot plate, microwave, electric kettle, a small sink, and some pots and utensils, but it is not set up for full cooking. There was a coffee maker that only takes little pucks, but there were no pucks when I visited (and there was no time for Helena to get them because of the short notice). There is also a washing machine upstairs outside of Helena's own apartment, which I ended up not needing. Be aware that because the apartment faces on an air shaft, so it can be dark earlier in the morning.
The sofa in the sitting room could use a cleaning, but otherwise everything was fine.