This is my third year in Madrid. I have stayed in Arguelles and Callao before but Izabella's place is by far the best!
Super clean! Very functional! You have two metro stops within one or two blocks: Lavapiés and Antón Martin. It is one metro stop from Sol. It is a 10 minutes walk to the Atocha train station. This place has all the amenities you need and more. We were there for a month and we had a more than pleasant stay.
We enjoy the balcony, the cable tv, the washer, and the comfort of the bed. We highly recommend you this place. Izabella is an amazing host! Thanks, Izabella, you rock!