We stayed in Marina's apartment for 5 nights, and it was perfect for our needs. Marina greeted us on arrival and was very helpful. She made sure we knew how everything in the apartment worked and even sat down with us to talk us through the best places to visit in Madrid.
The apartment is fully equipped as advertised and despite the bed being a sofa bed, we had a comfortable nights sleep. We found that the apartment can be noisy in the late mornings/early evenings but this is to be expected when staying in an apartment block in the centre of the city.
The location of the apartment is what makes this apartment special. It is located conveniently next to a metro station but everything is within walking distance. We explored Madrid on foot and this is the best way to see the city.
We would recommend Marina's apartment as a great place to stay in Madrid.