"Dwarf cichlid" really isn't a well-defined term, but Kym's figures are accurate.
However, the real issue here isn't compatibility in terms of temperament but rather water chemistry. Most "community fish" like tetras, corydoras, barbs, rasboras, etc. come from soft, acidic water while Neolamprologus leleupi comes from the hard, alkaline waters of Lake Tanganyika in Africa. For that reason, I wouldn't suggest keeping this fish in a community tank. There might also be aggression or other compatibility issues as well, but the chemistry is reason enough not to keep these guys with regular community fish. They do work well in small Tanganyika community tanks, though.