Delphine and Guillaume have a perfect apartment for a stay in Paris! We stayed for the week between Christmas and New Years in their lovely apartment and couldn't have been happier with our choice! The location is absolutely perfect, right in Le Marais above a charming little square with a few cafes. The cafes were generally full of locals, which made for a great atmosphere, but it was always quiet in the apartment. The apartment was very convenient to everything in Le Marais, and it was a quick walk to the Saint-Paul metro stop to connect to the rest of the city. There are also some fantastic bistros in the area, all within easy walking distance.
The apartment itself is nice a cosy, decorated well, and is a good size for a European apartment. We never felt overly cramped on space. The bed was nice and comfortable, and the heat worked well and kept the apartment warm in the winter. The availability of a washer (AND dryer) and dishwasher was also a great feature, and Delphine and Guillaume left a great user manual on exactly how to use all of them. Do note that there is no true "shower", but rather a tub with a handheld shower attachment. We had no issues with it and still were able to shower just fine.
We would not hesitate to stay at Delphine and Guillaume's apartment again in the future, and will certainly look for its availability the next time we are in Paris!