I'm a bit worried after reading this review from calgarytravellers86 only. We are booked into Green Hills in Jan 2018. We've stayed in Arusha a few times and chose Green Hills because it is an affordable lodge and we've previously stayed at the other hotel of the owners. I know it's new and seems to have had a few teething problems, but doesn't sound like they've been sorted? I can cope with limited hot water and electricity, but not damp beds.
Dear Ann, this year rainy season brought heavy rains in April and May which always leads to high humidity also inside of buildings. In January it will be dry season and you will not experience damp beds!