This was all we needed for our trip, we were 3 on a business trip combined with some touristy visiting. Very nice appartment in the middle of Paris in a vibrant neighbourhood, close to everything. If you are looking for luxury, this might not be you but for young travelers looking for a fallout base for Paris this is ideal. I would say 4 is a comfortable maximum. You can make it work with 6 people if you squeeze in but it would be tight.
Anna was really nice, we were a little late and she checked up on us just to see if everything was alright and to ask if she could assist. She was available when we needed her and made us feel welcome.