In my opinion, Montepulciano is the best place hands down. We have travelled to there so many times and it keeps pulling us back. The restaurants are fantastic, there are wonderful shops and galleries lining its streets, and amazing cafes.
Montepulciano is also a great base to also explore uncountable hilltop towns and wineries. Within a short drive, you could even visit Cortona, the setting for "Under the Tuscan Sun" - although much of it was actually filmed in Montepulciano!
Here are a few of our favorite places to help you:
Montepulciano Dining Suggestions:
L'Altro Cantuccio (http://www.laltrocantuccio.it/) – this is an amazing restaurant that puts a modern twist on typical local recipes. Their food is art, but it is not pretentious at all! This is a laid-back place that happens to produce amazing food.
La Grotta (http://www.lagrottamontepulciano.it/intro.php) – this is probably the most elegant restaurant. It’s located at the base of San Biagio, the 500-year-old church at the base of town. While the first two restaurant are more laid back, this is a restaurant you should dress up to eat at. Wonderful food and wonderful service.
Montepulciano Accommodation Suggestions:
Fonte Martino Guest House (https://www.fontemartino.com) – this is a little gem located just outside of town, but close enough that we walked to town. I came across it last year and have stayed twice and will be there again this October. The owners are American and created something really special that is beautiful and full of amenities. They really helped me on suggesting amazing places to see and experience. Based on what you described - watching "Under the Tuscan Sun" - this is probably the place for you! That's one of the reasons I was drawn to it.
Charming Homes Montepulciano (https://www.charminghomemontepulciano.com/en/) – These are charming apartments located in the city walls of Montepulciano. We personally stayed in Alberto57 and it was wonderful. Very clean and perfectly located along the main Corso (main shopping street). Alberto (the host) is a wonderful person as well. There are great little cafes for morning breakfast and Caffe Poliziano, an amazing 150 year old art-deco café, is only a short walk up the corso.
I hope this helps you out - have a great trip!