If you are going to Tanzania, I have some suggestions...
Very Best-Ngorongoro Crater Lodge
Gibbs Farm-outside Arusha
Arusha Coffee Lodge-charming place to stay when arriving or departing from Arusha
Tarangire Treetops Lodge-Very Best
Safari Company-Thompson Safaris was excellent in every way
What a wonderful country and fantastic experience and no sickness/bug bites of any kind (we went in June)
Definintely second the recommendation of Crater Lodge -- it's amazing! I've stayed at both Tree Camp and North Camp. It's nearly always full so I'd be surprised if they listed on LL, but I've seen some other CCA properties listed here so it's always possible.
BTW Gibbs Farm is near Karatu, not Arusha -- it's one of the non-Crater rim properties for people who want to visit the Crater but either can't afford or can't find space on the Crater rim.