My husband and I and our two children had a wonderful stay at La Fortezza. The house and the grounds are even more beautiful than the pictures let on and you can see the sea from the dining room table. Polignano is a lovely little town and you will definitely enjoy exploring the surrounding towns as well. Francesca's restaurant and shopping recommendations are great.
We were there during an unusually cold time (with snow!) so there were a few issues related to the extreme cold -- some ants and sewer gas odors in the bathroom. Francesca was very responsive and said she was working to get the issues resolved. Please also note that the house doesn't have a smoke detector. We brought our own.