Chez Ahmed
This small but clean café and guesthouse is next door to the Kasbah Telouet parking lot and Ahmed, the owner, is very knowledgeable of Glaoui history and can organize tours of the surrounding area. He is also happy to sit and chat as well as feed you well for around 70 DH.
If you do not wish to take a tour, politely make this known toward the beginning of your conversation.