My understanding of gulets is that there are motorboats with a
mast and
rigging to look like a sailboat. If you look at the dimensions of the
rigging you see that it can not be used with whatever
wind conditions, it is just for show.
Enter “la spezia” and “charter” in your favorite search
engine, select map and choose one of the proposed
charter companies. I was there a week ago, the season is very low key, you will not have any difficulty in finding what you want for the 2 of you.