We had an amazing time in Madrid.
The location is great, clean and right in the center with many bars and restaurants around, a few subway stations within the walking distance ( 3 min away)
We walked to the train station, to museums, markets, and shopping streets.
The host was very helpful in suggesting places and activities.
the only downside is that it's noisy on the streets - so we kept windows closed at night. ( I guess it's the downside of being in the center of a big city)