Welcome to the forum
I stayed at Dolly Copp for the first time this past weekend. I liked it probable because it was very close to where I needed to be but, I will stay there again in the fall. From Dolly Copp, if you drive appx 6-8 miles South on Rte 16 to the Pinkham Notch visitor Ctr, they have coin operated showers there and apparently alot of the trails start there too. Dolly Copp had flush toilets and fire wood was available for a fee but, there aren't any stores for about 20 miles either way (south or north) of Dolly Copp.
Hope that helps a bit
Club Member, Mt Washington Observatory
~ Hike upward and find your Mountain ~