My parents and I had a fantastic time staying at Maria's apartment. We didn't get to meet Maria as she was away on holiday however her friend Sarah met us quite late at night and was very welcoming. You really couldn't ask for a better location. The apartment is very spacious, clean and beautifully laid out with interesting furniture and design objects. The beds were both very comfy.
About the own downside I can mention, and it wasn't a major deal, is that the second bedroom gets a lot of light through the curtains and a bit of noise from the street below (its not a noisy area however) so you may want to bring some ear plugs and an eye mask.
Would definitely stay here again!