Haven't personally stayed at any Sangiovese near San Gimignano so I can't tell you anything about it. Just keep in mind that the name is very general and unless you tell us very specifically which property you are referring to, it might be hard to get feedback. Many agencies change the names of the properties they manage so that you can't then go search for the property and reserve directly.
Hope you get some feedback and get the info. you were looking for!