We stayed two night at Israel's place.
Israel contacted us severals weeks before our arrival to double check our arrival time and sent us detailed directions and how to get there, which was appreciated.
He met us in person to check-in and to show us around the apartment. He gave us a lot of helpful information about the building and the surrounding area of the city. There is a good map and some information located outside of the apartment door in the hallway. Everything was clean and the apartment itself is very modern and sleek. Seemed to have everything you would need during a short or extended stay. Pictures and apartment listing are very accurate.
One whole wall is windows facing down over Calle de Carretas and provides for great people watching from the comfort of the apartment. There is a huge curtain that you can close at night and it blocks out almost all of the light to make the apartment pretty dark.
We never heard any noise from within the building but as other reviewers have noted, the busy pedestrian street outside is VERY loud until late at night. Earplugs are provided by Israel if you want to use them.
It is a great location for almost all of the major sights within central Madrid. There are all kinds of shops and places to eat nearby. It is just a couple minute walk to the Sol subway station to get to and from the apartment but otherwise you really don't need to use the subway much to get around since the location is so close to everything.
Also, as seemed common in Spain, you had to use several different keys to open the door to the building, main hallway and then to the room as well and with only one set it can be a bit tricky if everyone in the unit isn't coming or going at the same time but again, not something unique to this unit but just something to be aware of.
We would definitely consider staying here again if we happen to be in Madrid sometime in the future