We had a fantastic stay in this extremely central yet quiet apartment. It had everything we needed and provided a great work environment too (good internet, good working premises). Everything felt like it was a short walk away, the beds are comfortable and the place overall very clean. The AC can be a bit noisy (as it goes on and off throughout the night) but nothing earplugs can't block for the sensitive ears. I would highly recommend this place for anyone traveling to Madrid - we would definitely come back.