Can Augmented Reality (AR) techniques inform the design and implementation of a mobile multimedia guide for the museum setting? Drawing from our experience both on previous mobile museum guides projects and in AR technology, we present a fully functional prototype of an AR-enabled mobile multimedia museum guide, designed and implemented for the Museum of Fine Arts in Rennes, France. We report on the life cycle of the prototype and the methodology employed for the AR approach as well as on the selected mixed method evaluation process; finally,the first results emerging from quantitative evaluation are discussed, supported by evidence and findings from the qualitative part of the assessment process. We conclude with lessons learned during the full circle of conception,implementation, testing and assessment of the guide.