The staff were friendly and assistance was top notch - they helped book our day trip to Versailles! The rooms were clean and tidy, spacious and well set out (no fridge though in my room). The neighbourhood was great - walking to distance to Galeries Lafayette and Opéra district, and a stones throw from Montmartre. Metro was just and easy distance. The restaurant Papillon & Co. did not have the best breakfast (but was great for evening drinks), but just a couple blocks away was Corner Haussman that met our French expectations and needs for breakfast. Overall M Social was an amazing experience and I would stay there again!