Sergio's place is excellent value for the cost. It's a relatively short walk from the train station, though if you've got a lot of luggage, or if you're tired, you should take a cheap uber (about 5-5.50 eu.) We were able to walk to the Plaza Mayor, Botanical Gardens, Ritero, and Barrio La Latina, even with my injured ankle, so the location is convenient. There's also a cute breakfast place on the corner immediately across the street, which is perfect for a little cafe con leche or some fresh bread and pastries. Sergio is an excellent host; highly communicative, helpful, and he makes things easy. Oh and internet works just fine for anyone who might be worried!