We have been at the flamingo hotel before and also after our safari.
The hotel is clean and perfectly located in the center of arusha if you want to visit the center. Rooms are simple but nice and clean.
The managers are also nice and help us quickly when we needed.
To summarize, it is a great hotel if you want something clean and to be in the center and dont want to pay to much. The breakfast is also ok (tee /coffee, bread, jam, eggs, fruits...).
Yes, there is the mosquee juste near: noice between 5.30 am and around 6 am but for us it was ok.
I recommend this hotel.