We spent two nights at Le Jacaranda Hotel Arusha after our safari and it was a pleasant stay. The gardens are lovely and the room we had was big and spacious, bathroom was redone and nice although the hot water took a while to come on it eventually got there.
The service was good, very helpful and friendly and their laundry service was good. Pricey but consistent with prices in other parts of Tanzania and we got all our items back, not something that happened in a lot of other places.
We'd stay again if we find ourselves back in Arusha. We met a lot of other travelers here and a number of people who stay on a regular basis