We stayed at Meyling's place for three weeks and we had a very relaxing time.
The best feature of the flat is location: we could walk every where, no need to take public transportation at all. Yet, if you need to use public transportation you will have no trouble because the metro is just a block away. In addition to that, there are many nice cafes, restaurants and bars very close. Gran Via, Fuencarral and Preciados, known as shopping areas are all VERY close.
The flat is almost like a loft: there is a good living room together with the kitchen (well furnished by the way), the bathroom separating this social area to the bedroom.
The apartment is silent and from the bedroom you almost don't listen noise from the street (only sometimes you can hear some of the neighbours).
We certainly recommend Meyling's place.