Ely was a truly great guide, and if you're serious about seeing the local side of Mauritania outside of Nouakchott I completely recommend his services. As a tourist outside of the capital, there are police checkpoints everywhere and the small towns/cities are very difficult to navigate - transport is mostly random local cars driven by people on fixed routes that only the locals know, none of the inter-city busses operate on fixed timetables, and most hotels in the smaller towns are not listed on maps apps or online. Without Ely's help, there is no way I could have seen anywhere near as much as we did, even as a very experienced traveller. He gets you local prices on everything and knows how to see the most that you can on any given budget. Also great English and French. Ely is highly professional, and if I go to Mauritania again he would be the first person I contact.