Emma made us feel very welcome. She was very flexible with the check-in time and even offered to book us a transfer from the airport to the apartment (although we decided to try out the Madrid Metro system).
We met her at the apartment which was exactly as described. It was a very pleasant apartment and the location was perfect. It was only a 5 minute walk from the main square (Sol) and within walking distance of everything we needed. I would not hesitate to contact Emma and use her apartment again if/when I return to Madrid.