1. Can't beat the location. We did a 4.5day stay and walked everywhere. Wonderful cafes, bars, tapas bars, chocolaterias, close by. Walked to the Prado and even to a Real Madrid game (was a bit of a walk but fun).
2. Roomy by European airbnb standards and fully equipped. Really no suggestions for improvement.
3. Some reviewers had mentioned that the street was lively and had some street noise - we did not find that a problem at all.
4. Helen and Martin are fantastic hosts - great to communicate with and we feel like we made two new friends in Madrid