Giovanna is a very good host, kind, helpful and caring: she (and her husband) really care about their guests.
The Trullo is very nice too: lovely house, beautiful garden, large terrace. Well located too: not far from the city center, and at a good distance from the bustling city.
The only negative point: a railway just behind the house (1 meter behind actually) that is not too anoying but a little bit disturbing, and that can be dangerous if you come with children (there is no protection and they can easilly access the rails). Not a problem during our trip, but we would have liked to know before our arrival.
We had a really good time there, and Alberobello is absolutely marvelous !