I had to travel to Ouagadougou in late September on a business trip. This hotel was one on a list provided by my embassy as safe and reasonable, and it turned out to be both.
As others have said, remember where you are. Burkina is the the third least developed country in the world, with a literacy rate of 75% and a life expectancy of only 45 years. This is listed as a 4/5-star hotel, and if you compare it to 5-stars in the west you will be sadly disappointed.
That said, the bathroom was immaculate and bottled water was provided (many people forget to use safe water while cleaning their teeth).
Towels and linens were adequate and clean, and soap and shampoo/conditioner were provided as well (don't take it for granted that these will be provided when traveling in Africa - or elsewhere!). There was a big sliding door and a balcony overlooking the front of the hotel.
To be honest my room was horrible - carpets were tatty and stained, and the place smelled. But I got to look at some other rooms while they were open for cleaning and they were much better, so don't be put off and ask for another room if you get given 503. I was only there to sleep, so I didn't ask for another one, and as they say, that which does not kill us, etc.
The air conditioning worked, but you need a spare key to keep it on when you leave the room (keeping it cool will reduce the risk of mosquitoes). If you don't happen to carry a spare hotel key out of habit like I do just for these purposes, you could ask the hotel for two keys (they may or may not oblige if only one in the room), or use another key sized card. Probably not wise to use a card you might regret losing.
The pool looked clean and well cared for. Restaurants and bars were reasonable, food was good if you chose local fare, and the bar was well stocked with most western beverages. There was an internet cafe on the premises, but there was wifi in the lobby and wired internet in the rooms.
A short distance down the street is a market selling local knick-knacks and other goods, and there is a lobby shop selling clothes and statues. Haggle, though, but as always, once you start to haggle, be serious and don't waste their time.
There is a nightclub and pub round the back of the hotel (out of the front door, turn right), which I visited but didn't stay at; it was late and it looked like all the women were working and all the men were waiting their turn. Perhaps unfair, but that was my impression.
They have an airport shuttle, which is useful, but leaving by air is a trial - multiple searches, poor facilities and no aircon at the airport, but they are rebuilding parts of it, so that may change.
The staff were friendly, but not a lot of English is spoken, so if you have any French, use it - it will be appreciated. To be honest I didn't suffer any of the horrors others have described, but I have a high tolerance for such stuff and perhaps am not the best to judge. You might also consider the cultural context in this case - the staff are the product of generations of subsistence farmers who took life's knocks and wore them like badges of honour. They probably can't understand why fat white guys with so much going for them would complain about slow service and a few stains and smells when they endure much worse on a daily basis. No wonder they are slow to react - they don't understand the fuss.
I liked the hotel, I would definitely stay again (but not in 503!)
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC