Antonio is a lovely host, and was waiting for us as we arrived at the apartment. He had a map for us and took the time to show us the major attractions and to get our bearings. He also had a bottle of wine, which was a nice touch. All amenities required were available, and unit was tastefully decorated/renovated, although just be aware there is no lift. Antonio also organised a taxi for us for our trip back to the airport.
As for the location, I intentionally picked La Latina area due to convenience. It was even better than expected, with easy walks to many of the areas we wanted to visit, including Mercado de San Miguel. The El Rastro outdoor market( open on sundays) are also right at your doorstep, and is absolutely amazing. They run over many streets. Heaps of restaurants and convenience shops are readily available, and the La Latina Metro is a short walk away.
We were very happy with our stay here and would definitely recommend.