Sestriere is a friendly resort with an interesting history, being the first purpose built ski resort in Europe.
The access to the wider area is via Gondola, which is often blowed due to high winds.
The skiing at Sestriere is limited. You will have done everything in a day. However, the slopes are quiet, we had zero lift queues and nice food on the mountain.
The lifts are old, slow and have no covers / heating.
Cheap lift passes make it decent overall value for money and definitely a good place to learn.