I never met Katherine but her mum, who was absolutely lovely, looked after me in Madrid and helped me get my bearings when I visited this city (first visit to Madrid). The flat is lovely, close to shops, places to eat and a metro station about 2 minutes walk from their house. This was so handy getting back and fore to the centre of Madrid. Also took a taxi one night which was also cheap from the Sol. The only thing I would say is due to the layout of the flat, tthe room I stayed in did not have any natural light, but it really didn't matter as I think I spent more time out than in! Flat was also lovely and clean. I would definately recommend staying there.