Martine & Karim's space is simply lovely. It was very tastefully decorated in a modern Japanese/Scandinavian style, with every amenity one could need. The huge windows and fan were a must have for the summer heat in Paris, but I never got too overheated. The modern shower was very refreshing and they provided every toiletry that one could need and then some!
As other reviews have stated, they graciously provided me with everything I needed for a Parisian breakfast, with fresh marmalade, a loaf of bread and toaster, and the kitchen (though it could be considered small by American standards) was fully equipped with everything you could need for a meal. The espresso machine was a huge help with my jetlag, and a selection of teas was also available.
They were very gracious with understanding a mistake that I made in booking on the wrong day and helped me to fix things quickly. Communication was clear, quick, and very kind.
The neighborhood, Butte-aux-Cailles is utterly lovely. It has a quiet, almost village-like feel, and was very lively in the evening. Not far from the art school Gobelins, it's an artistic neighborhood with a wealth of very cool street art and was a great place to wander around and just take in the city. Though it's not in the center of the city, it isn't too far. It's not only very accessible to the Left Bank, it's also just steps from the metro.
Martine & Karim have helpfully left the cards of local businesses and pamphlets for local exhibits in the room as well, if you want some tips on where to go and what to see while visiting. I am a bit shy and didn't want to impose, but I got the impression that they would have been more than happy to give me travel tips if I had asked.
It was my first time in Paris, and I was traveling alone. It's an intimidating place when your French is not so good, but both this neighborhood and Martine & Karim's space were so welcoming that it made exploring the city much easier! I would love to stay here again, and would recommend the room to anyone who wants a quiet, relaxing stay in Paris.