Stephanie's place worked well for what our group of 7 needed. Generally clean and tidy, good location close to Parque el Retiro and within walking distance of Gran Via and other central Madrid hotspots, as well as a short walk to a Metro line.
Only having one toilet/bathroom was a bit of a struggle at times but overall, did what we needed it to do, and provided a good stay for us. Building was very quiet - didn't hear anything at all from neighbours etc. And street was generally quiet, too.