I took a coffee tour with Nate in a mixed group setting (some pairs and small groups, but I was solo) back in November.
Nate was very sociable, friendly, and accommodating. The tour had us going to three major stops, with some minor sightseeing / neighborhood history happening during the walks from site-to-site.
The coffee tasted great, I learned a lot, even as an avid coffee drinker, and the whole group felt like lifelong friends by the end of our tour.
I think this tour would be a great way for an out-of-towner or two to spend an afternoon. Could also be a nice excuse to get out and see new parts of Brooklyn for locals, as well. Either way, definitely worth every minute and every penny.