The taxi fair is a bit more than 15 euros from the airport - we paid 18-19 each way, but I think it is still the worth it, to avoid the hassle and time of changing busses.
The home was wonderful, very authentic and definitely more fun than a hotel! The room was nice and clean and the beds had good, warm covers here in January. Maria Teresa's husband prepared breakfast for us in the morning, and he was also mostly the one to host us. He did not speak english, though, which made it difficult to communicate and to get good recommendations about where to go in the city or answers to the questions that arise during a visit to a foreign place. When staying in a local home, that was something we had hoped to be able to do.
Overall a good experience, especially due to the location from which you are able to reach the whole city center by foot.