We recently stayed at the Gorillas Lake Kivu Hotel in Gisenyi. It is as you described but there is one significant problem. They have no mosquito nets. Instead, they clean the rooms then spray with an insecticide and then keep the windows and doors sealed. There is no air conditioning. It is impossible to sleep in the sealed insecticide filled room, so one needs to open the windows and that means hundreds of mosquito bites. The problem would be easily solved with a simple mosquito net!