We had a wonderful stay in Emma's apartment. The location was central and the apartment was very comfortable. We loved all the balconies that opened out into the street and did not find the location loud at all. There's a fantastic hipstery Japanese cafe at the corner downstairs with great coffee and breakfast that we went to every day. Note that only 3 out of 4 bedrooms have an A/C unit - we happened to be in Madrid during a heatwave where it was over 100 degrees Fahrenheit, so it was a bit hot for our friends who stayed in that room, but it is probably fine most times of the year as it does generally get much cooler at night.