A comfortable stay. Apartment is in a great location in the heart of the city. If you can't reach where you want to go on foot, then there are at least 3 metro stops within a few minutes walk, and plenty of taxis. There is a bar opposite but the street is reasonably quiet, with the windows shut you can hear very little. Plenty of mini supermarkets close by, and if you like coffee try either Hanso cafe or cafe de luz, both rank highly on tripadvisor, both easy to walk to...but there are plenty of other cafes in the area.
The apartment itself is very secure (3 doors to get in) well laid out, and has everything you need if you wanted to stay in and cook, beds are comfortable and showers do the trick. We put the tv on once for background music. There appeared to be no English speaking stations, but you really shouldn't be going to Madrid to watch the tv, you can do that at home.
Lola your host for your stay is very responsive to texts and very helpful.
The check in and check out were very simple. Lolas' English is very good, so ask as many stupid questions as you like and enjoy.