The flat is extremely well located, right in the heart of Madrid. Room is clean and nice. We did not meet Charles as he was out of town but his sister Gisele was there when we arrived. We did not really interact with her as she seems a discreet person, minding her own business. I would say this place is great if you are looking for a central location in the city for a good price, but if you are looking for the "share with your host enjoyable time and tips" that air bnb promotes, well maybe not.