We really enjoyed our stay. We rented a 2 bedroom with our 14, 11 and 5 year old. It was plenty large for our family of five. The unit has two bathrooms. One bathroom with a toilet and shower, the other has a tub/shower/sink and the toilet is in a separate room across the hall. The kitchen had all you could need to make a quick meal at home. The washer/dryer was handy too...although the cycle takes several hours to run. The unit was very clean and feels more like a hotel than condo. Its located in the 7th, and we enjoyed this area a lot. A very short walk to the Metro, lots of restaurants and cafes on Rue de Cler (one block away), a 10-15 minute walk to the Eiffel Tower, and lots of clothing boutiques with in a few blocks.
My parents rented a one bedroom on the ground floor as well. It opened to the center courtyard and was a lovely space.
Ma Maision Invalides has about 30 units in the building. It was clean, quiet, felt very safe and I would absolutely stay here again.