The place is great for a Madrid visit. We stayed there for one weekend and we never used public transport - Placa de Major is a 10-15min Walk for example. The place is in a silent street, a little supermarket is close by. The apartment was clean and had everything you need.
I have to mention the hospitality of Eduardo, who welcomed us a 1am in the morning & arranges airport transfers, which all worked out perfectly. Thanks for your hospitality! I can only recommend this place.