We would 100% recommend staying at Kristian's. We stayed here in July for a long weekend and the flat was perfect for what we needed. You couldn't ask for anything more central and within walking distance to everywhere you would want to see. The flat itself is tucked away so is quiet and a perfect place to relax after a busy day walking round the city. The flat was spotless when we arrived and Kristian made sure we had everything we needed. His local recommendations were great, particularly for tapas and rooftop bars. We loved our time in Madrid and would definitely recommend Kristian's apartment as a perfect base to explore the city from!