A friend of mine and I were staying for 3 nights at Eduardo's place. Before booking we were slightly apprehensive as the room was underground without any windows. However, on staying there for 3 nights and 3 days, i have to say that we did not even notice it. In fact the place is extremely well done up. The room was well lit up and very artistically designed. Some additional pointers:
1) There are 2 toilets, and 2 bathrooms on shared basis. We never faced a problem with this.
2) Eduardo kept his kitchen stocked. So we usually had breakfast there. The entire kitchen was available to us, so we were also able to cook easy dinners for ourselves at night.
3) The room we had was beautiful. The beds were extremely comfortable.
4) Eduardo was very helpful with tips on local travel.
5) There was a de-humidifier and air purifier in the room. We never needed to use either. Overall, it was one of the nicer places I've stayed at during my travels in Europe.