Although, I personally did not get a chance to talk with Julian much, we had a great stay there and he was in touch with my mates, and very quick with responses. Our water heater broke down and he got someone to fix it within 30 mins of us reporting it. He was also very helpful with the city guides, parking etc. The apartment is located in the heart of Centro district, is 10-15 min walk from all major attractions and is sparkly clean. If you're driving here, I'd suggest start looking for a parking spot within 500-1000m distance (or even more) as parking close to the apartment is close to impossible due to the narrow streets and it being Madrid. But other than that, I totally recommend Julian's place!