Staying at Claude's apartment in her guest room was nothing short of the most magical Parisian experience. I could not have dreamed of better accommodation. I will return again and again if I can.
As others mentioned, you do not have full access to the kitchen, but Claude is so kind and generous to let you put a few small things in the fridge if you need them for breakfast or evening snacks. Do not let the kitchen situation deter you from staying here!! You cannot find a better place in the 4th.
Communication is lovely—great instructions in advance and during your stay. The wifi is solid in case you need a work meeting to two. Claude was kind enough to offer a small vase of water each day for drinking, so you do not have to buy surplus water bottles. The building, on the whole, is very, very safe. From entry and how to enter/exit the building.
There are private balconies off of the bedroom and the bathroom. The bathroom has everything you need for a luxurious night in, with a large soaking tub, a heating rack to keep your clothes warm, and a kettle to drink some tea. I will keep dreaming of Claude's apartment when I think back on my trip to Paris.