We didn't meet Kristian, but his flat is modern, spacious, very clean, fresh, comfortable and airy and situated in an interesting old traditional apartment block.
The location is superb, just a couple of minutes walk from Plaza Mayor, and near the metro at Tirso de Molino, and yet a quiet street. You can visit most of the main points of interest easily on foot from here.
Recommend Mas el Sur for atmosphere and great foodat good prices - between Reina Sofia art gallery (free evening visiting) and Kristian's flat.