Absolutely fantastic apartment.
The location is so central, within walking distance from many sites (the closest being Centre Pompidou, Hotel De Ville, Notre Dame and Place des Vosges). If you like walking as I do, it’s also an enjoyable walk to Jardin Du Luxembourg, the Louvre, Musée d’Orsay, and Bastille. It is a few minutes walk away from the Hotel de Ville metro stop which has lines 1 (the main line - the very next stop is Châtelet which is like the main station) and 11 (connects to Belleville area which is nice).
There is a Franprix grocery store on the next street. Also on the nearby Rue Saint-Antoine are many grocers selling fresh fruit and meats etc. There are also many cafes and patisseries/boulangeries nearby. If you’re into shopping I recommend staying here as you’re surrounded by some of the best shopping destinations in Paris.
The apartment itself is super spacious, with high ceilings and windows that open up onto a quiet court yard and allow fresh air to come in. The bed is huge and comfortable. The wifi is perfect. As a female travelling alone I felt very safe in this apartment, with double security doors downstairs and a bolt lock on the door. The neighbourhood of Le Marais is really lively at night. I never felt unsafe walking from the metro to the apartment alone.
Overall I would definitely recommend staying here, it really felt like home during the month of my stay :)