We had a great stay at Madrid. I had some problems with the online check-in. Did contact Amazinn Places and they solved it easily for me. They answered quickly (within one hour as promised) and were really helpful with all my questions and the information they gave me for our stay.
The flat is clean and nice and really well located in the centre. Easy to arrive by the metro and also easy to walk most of the sightseen places. The neighbourhood is vivid - full of bars, restaurants, take aways and small shops.
We were a little surprised as there is a bar under the flat and the windows weren't that good isolated. So it's kind of noisy. But, when we were there, the bar closed at 12 o'clock in the evening, so we got enough sleep for the next day.
Altogether a great stay in a really nice city - we recommend Amazinn Places for your stay.