Awesome tour of Salem, way casual, Tom was very knowledgeable and could answer just about any question. I wouldn't want a tour from any other groups, they were more about theatrics and being silly, this tour was very historical and educational, but also very entertaining. Don't forget to bring some beer and newport menthols as a tip.
Went with my wife and 1.5 year old, it was an enjoyable walk, no stair climbing and easy to use a stroller on. I imagine it would be fine for a wheelchair as well.