I've stayed in 14 hotels in Tunisia over the past 5 years. Standards are different than in Europe and North America.The Yadis Oasis Kebilli is very good by Tunisian standards.
The staff are professional and helpful. The public areas and rooms are reasonably clean. I did find ants in the bathroom, but not many. The beds are comfortable, there is hot water, breakfast is good, and dinner (for an additional 14 TDN) is excellent. Although the hotel is about a 20 min. walk from town, it is a pleasant walk and you can always take a taxi if you want. The room rates are surprisingly high, but, there aren't many choices in Kebilli. I'd recommend Yadis Oasis if your travels take you to Kebilli.