I interviewed there last year. They are very quick with the interviewing process since they want to accept their fellows (2) by the time the ASDP conference rolls around (early October). There has to be at least one dermatology-trained fellow since the pathology experience of the fellowship requires this. The other fellow can either be pathology or dermatology-trained, but I did get a slight sense that dermatologists were preferred.
Danville, like the others have said, is a small & quiet town, approximately 3 hours from Philadelphia. There's not too much to do there so if you're looking for a happening place, you'll be disappointed. However, it's only a year so you can suck it up.
The 4 attendings (3 dermatology-trained and 1 pathology-trained) are all very nice. The volume is high with a good mixture of cases. On interview day, you will sit at the scope with all 4 attendings for about ~half an hour/each. Expect that Dr. Elston will ask you for your diagnoses of the cases he's signing out.
The dermatology clinic experience is chill and you basically shadow the resident & attending so that you can to see all the pertinent lesions that may be asked on your boards.
Over all, it's a solid program. Good luck!