We travelled as a couple. We have stayed in the apartment for a month (Nov/Dec) as were working on a job project in Madrid.
We know Madrid pretty well and we were looking for the location close to the city where all the action take place but the same time it was important to find a spot with a quiet surrounding.
This was a very good choice of ours. Luis' apartment is located in a small one direction street with zero noise. Its close (5-10 minutes walk) to La Latina district with a lot places to eat or drink. There is Dia Supermarket close by if you prefer to cook for yourself.

If you are a tourist and you like to walk you can very easy access the Royal Palace (15 minutes walking), Plaza del Sol or Plaza Mayor (20 minutes).
La Latina metro station is 10 minutes away so then you have an easy access to the full communication network.

The apartment is very bright. There is a separate bedroom with really comfortable bed. The neighbour sleeps really long in the morning, so sometimes he was knocking the wall when we started discussing at 9 am in bed ;)
There is a big desk and a kitchen table so both of us could work (which was important for us).
You have also a comfortable sofa at the main room, that can be used for the second bed if you need it.
The kitchen and the bathroom are really small but it was ok for us.

The internet is really good - you can watch movies online, work via skype etc. whatever you need.
You also have a cable TV that we didn't really watched.

Luis provided us the list of his recommendations for restaurants. We have checked some of them and we were very happy with the choice.
He was very accessible by the phone or text messages. At the time of the reservation he was primarily not able to offer us the full month availability but he was so flexible and creative that he found a solution and we rented the spot for the full month as we intended.