I really enjoyed my stay in Kanaani Resthouse: very friendly and helpful staff, nice panaroma view, great food (always a big selection from a yummy, creative homemade buffet).
Sabine, the owner, creates a special familiar atmosphere and is very helpful in organizing activities (recommended me a nice guide for a three day walk) and transport (e.g. taxi and bus ticket). I also enjoyed the interesting talks about Tanzania and culture with her.