This is a great place to stay in Madrid. Very nice and clean, modern furnishing, stainless steel Bosch appliances, close to grocery market, lots of nice restaurants, and last but the most important: Irene is a great host.
Apartment is close to the Atocha train station (taxi costs around 7 euro) and the main attractions are 20 -30 mins walk away: this includes Royal Palace, Prado Museum, Plaza Mayor, and Puerto de Sol. And do try the restaurants that Irene recommends: they have great food at reasonable prices. Once you eat there you will realize that the restaurants near tourist spots are ripping you off
Go ahead and book this place for your Madrid trip