Mathilde place is really good for a big group. There was nine of us made up of 2 seniors, 4 children and 3 adults. It's close to Les Halles metro which was 2 mins walk, shopping and restaurants, within walking distance to all attractions. However, apartment is on very busy main road and the traffic noise can be unbearable if windows are open at night trying to sleep, it was very hot at night.
Overall its very central and good for a big group, but if you are seeking for a quiet place to rest at night then it's not the right place for you.