I've stayed four weeks in J.M. Residence in June-July 2018. I was staying in the one located on Rue Gamal Abd el Nasser, the street behind the Notre-Dame Cathedral. The area is one of the safest in Bangui and it has electricity almost 24/7. (The hotel also has a backup generator.)
I was in one of the suits, which is a slightly larger room with a small hall and own bathroom. The room was very basic, but it was clean and had AC, fridge and TV. All windows and doors are equipped with mosquito nets. The hotel has wifi however the speed varies a lot, and is usually pretty slow.
The hotel has breakfast where they serve milk, cereals, bread & pastries, fruits, instant coffee and you can order eggs; they order the pastries and bread daily from Grand Cafe. The restaurant serves meals for lunch and dinner and they have room service which is very convenient.
All in all, the hotel is a good option to stay while in Bangui, however the room prices are high (which is the case everywhere in Bangui it seems).

There is some improvement over the last months. The management is clearly taking their task serious, with an updated telephone system, staff who are not performing are being replaced. They are clearly benefiting from the overall lack of decent accommodation here in town and maintain therefore also extremely high prices compare with average quality.

One of the three Jm residence in Bangui
Average place to sleep
Have internet
Was there on a Saturday when they had a late night event which I found to be noisy after a day's work but good place to spend all in all