We stayed 3 days / 2 nights in Marta's flat with our two little daughters. The apartment is spotless, and the beds are comfortable; it's pretty big and nicely decorated. The location is just perfect at 1min from the beach.
On the less positive side, we would say that, although it's a quiet building, the walls are very thin and you could hear the neighbors speak, some rooms don't have luminosity at all (kitchen, bedroom).
In the end, that's a recommended place, and we would come back again.