Great apartment with a very responsive host!
The location in the heart of Madrid and just minutes from the local train stop (and only a 25 minute walk from the main transportation hub) was very convenient. The neighborhood is lively at night, even on weekdays, but the sound-proofing keeps the apartment nice and quiet.
One tip: the water heater isn't very big, so plan to stagger your showers if you have more than one guest.