The host: My flight was delayed for more than 5 hours on Christmas Eve, Ignacio and his sister were at the apartment to meet me when I finally arrived. They are super nice, provided me maps of the city, pointed out places of interest, and brought my breakfast. Check out was very straight forward as well.
The location: very conveniently located. Walking distance to The Mushroom, cathedral, Alcazar, and the Spanish Plaza. No. 21 bus downstairs (every 15 min or so) goes to the long distance bus station Plaza de Armas, opposite direction one stop to the train station (can catch the airport bus there- line EA).
The apartment: very clean, strong Wifi in the room, and with breakfast.
In summary, wonderful host, nice amenities, great value, highly recommend!