Positives are that this is a presentable and perfectly located apartment in Madrid. Close to Plaza Mayor, a very short walk from Sol and many good restaurants. Also, the key access and arrangements are very good.
However, there were two things that would prevent me from recommending this place to any friends or returning myself.
The first is that every day the hot water was unreliable. You could get a minute of hot shower and then it would be stone cold.
But the main is the noise when trying to sleep in the spare room. Having read other reviews I thought that there may be some noise from passers by in the night but it was far more than that and made sleeping across our 3 nights in the apartment all but impossible. I slept with headphones on two nights. Outside there are frequent bin collections and on the Monday morning there was a large lorry delivery of kegs for the nearby bars. The banging of kegs on the stone Street is very loud and the delivery men are also loud when talking to each other.
All in all I cannot fault the location of the apartment or communication from Daniel but it was unfortunately let down by the noise and hot water. There is a restaurant next door that offers cheap food and drink (€4 for 5 beers, €1 for Jamon roll etc.) and many other authentic local restaurants.
Madrid itself is a beautiful city with lots to offer and not as expensive as a lot of other European capitals.