I have been using Siteman since my initial diagnosis in 2015. Fortunately I live in the St Louis Metro area.
Everyone takes their time to explain things and answer any questions. The main campus of Barnes, Jewish, Christian hospital (of which Siteman is part) has specialists for whatever you need who deal with cancer/melanoma patients. If you go to a derm, the derm will be one who deals with melanoma.
There are at least 2 satellite locations. It depends which locations your doc services. I am guessing you will go to the main campus of BJC. They have a guest house there. I have never used it so am not sure how to sign up for it, but that would be an otion to overnight instead of 3.5 hours to get there and then 3.5 hours back.
Their cafeteria food is not too terrible either. For a hospital that is.
I can say that I am very satisfiesd with my exams and treatments. ( NED since Oct 2017, still doing CT every 3 months )