My partner and I had a lovely time at Maria's place. We loved the neighbourhood - it's slightly more residential but still walking distance from the bustle, which we liked. It was also close to several local pastelarias where we'd get our morning coffee. The views on both sides of the apartment are phenomenal.
One thing to be mindful of is that it's on the top floor of a building on a steep hill. There are about 100 steps up to the apartment. This wasn't a problem for us, but it's something to consider if stairs and hills are an issue for you! There is, however, a bus that stops right outside the apartment that goes downtown which is great!
We didn't use the kitchen so I can't speak to what it's like to cook there. All in all, we had a great stay.