We really enjoyed our stay in this lovely apartment!
The apartment is located at the very center of Madrid, 100 meters from Lavapiés metro and 10 minutes walk from Sol and many other central locations in Madrid (we just never used the metro!).
It's consisted of a big space which is divided very elegantly into a living room, storage room, kitchen, bathroom and bedroom. Note that the "bedroom" is a mattress which lays on top of the storage room, so you need to use a small ladder to reach it. (make sure you remember to take a leek before you go to sleep! :-)
The apartment had every little thing we needed. The kitchen was fully equipped with dishes and glasses, pans and more (even a wine opener!).
In the living room we found a guitar, a stereo system with an AUX cable to which you can plugin your smartphone and play your favorite music, and even a small TV.
Miguel and Iaia were lovely, explained everything very clearly and left us to enjoy their apartment.
Bottom line - it was a great experience, and we really recommend it!