We (a married couple) stayed at the Savana in mid-January for two nights. We had been to Dakar before and were in town for work. We know the city pretty well and stayed in several hotels during this trip because of availability issues as it was the time of the Dakar Rally.
The hotel is popular with tourist groups and some business travelers, and it was actually booked solid while we were there because of the arrival of the Dakar Rally, which filled nearly every hotel room in the city. The surge of people into town made hotel rates quite high, so it's fair to say that we would have paid less during another period. Our rate was nearly $300/night. After staying there, it seems like the appropriate rate would be around half that, which is still high for West Africa, but perhaps not for the top tier hotels in Dakar.
The front desk staff are nice and the lobby is pleasant. The pool is huge and great for lap swimmers. It seems well kept, though neither of us used it.
The Savana's rooms look out over the pool onto the ocean, but they are actually quiet dark due to the outdated color scheme on the carpets, bed linens and curtains, and their small size. The walls are done in a sort of cottage-cheese-ceiling stucco style. The beds are comfortable enough and the bathrooms are fine. The rooms could all use makeovers, especially in this price range. There is internet access but you must pay extra - there are different prices depending on how many hours you want to use it.
The restaurant is really quite expensive for Dakar, but the Savana is rather secluded so people who stay there tend to eat there. We didn't find the food to be so tasty, either, and there are better places one can eat in Dakar. The breakfast area is pleasant, though, in the morning.
In Dakar, all taxis have to be negotiated before getting in, and the taxis that wait outside the Savana offer rates that can be three to four times the norm because they know that visitors who don't take them will have to walk about ten minutes out of the Cap Manuel area up towards the Plateau (downtown) area to get another taxi. But they can still be negotiated if you bargain hard.
If the goal is to just spend a day or two in a quiet hotel, away from the crazy city center, and budget isn't a serious question, the Savana is fine. If you're in Dakar for work, visiting people, etc., there are likely better options that cost less.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC