The apartment is just great. It has all the necessities and has a nice cozy feeling. I stayed in December and the heating was also quite sufficient. Rue Daguerre itself is beautiful with many nice bakeries and restaurants. It is well connected, with the metro station being less than 10 minutes by walk and even without taking any public transportation, e.g., the Latin quartier is around 25 minutes by walk.
Patrick is a wonderful and responsive host.
All in all I would fully recommend!