If you talk to him on a non-members' world, he would point out that it is a humiliation to stay in a world filled with non-members. After Biohazard is finished, he has no purpose whatsoever with your chatbox stating he isn't sufficiently moved to talk. He can be found in two locations: Rimmington and Varrock. In Rimmington, Da Vinci can be found pondering over his masterpiece outside the chemist's house west of the general store. While in Varrock, he can be found sipping a cold beer in the Dancing Donkey Inn. Da Vinci is always seen together with Hops and Chancy.