This apartment is a great location. 7 min walk to Les Halles station for RER and Metro, Chatelet Metro stop a little farther. The apartment is on a busy street so expect traffic noise from all bedroom. It felt very safe. Loads of restaurants and cafes within blocks.
The eleven of us women stayed in the apartment for less than 24 hours, but it was perfect. We could all congregate in one room for a glass of wine. We were given one key but that worked out well for us because I could share the code with my group so everyone could get in separately. There was an elevator to get bags upstairs. The place was spotless and spacious. Its basically two apartments connected together, two kitchens, two bathrooms, two shower rooms. The decor was minimalistic and tasteful.
Mathilda was helpful and very responsive. I would definitely recommend this apartment for large groups.