Arnoldo's place is absolutely brilliant for a stay in the centre of Madrid. It is literally by the main square, the San Miguel food market (which is superb) and there are multiple close Metro stations if you need to venture further out. The apartment itself is lovely, everything was very clean and having a smart TV for when returning back for the night is a huge plus. Arnaldo's instructions were very clear and easy to get in, very flexible if you're running a bit late too. I would highly recommend this to anyone wanting to head to Madrid. Thank you Arnaldo!