We really enjoyed staying at Maria's basement flat! It's very nicely decorated and the temperature was pleasant during these hot summer nights. We loved the garden and the little play house for our child! Going to the city center was very easy. We didn't meet Maria in person, but her son was very nice and helpful.
Just as a side note, parents of young toddlers need to pay attention. At least ours loved exploring the exposed decorations and climb up the stairs.
Otherwise, we totally recommend!