My group of 7 did the Village Sampler Tour with Danielle. There were 10 of us altogether on the tour, which was a perfect size because it wasn't too big nor too small.
Danielle was great! She was very friendly, really informative and kept the tour interesting. She also did it a perfect pace - there was no unnecessary lagging. At the beginning of the tour, she bought us all a bottle of water, and then purchased us chocolate from Jacques Torres in Chelsea Markets and a slice of pizza from the best pizza place I had in my stay in NYC. Good to do this tour during the beginning of your trip so that you can go back and spend more time at some of the stops. We ended up going back on later days to Chelsea Markets and the pizza joint - places we wouldn't of known or heard of on our own.
The tour went for around 3.5 hours; Danielle took us through 3 different neighbourhoods, pointing out various sights and historic landmarks along the way. You can tell that Danielle definitely has a genuine passion for the city she lives in, and she was definitely very knowledgeable. Had a great time on this tour and very reasonably priced at $40 - wished we could of done the other CityRover tours if we'd had more time.