I stayed at Alexandre's place for 6 weeks and loved it! It was a bit of a shock when I first walked in and saw how small it was, but I adjusted quickly. The location was by far the best part. Super walkable with lots of bus routes and metro lines close by. The RER B is two blocks away and takes you to/from CDG for $12! Also, the beautiful windows let in so much light and had a great view. Great spot for one person.
The bathroom is incredibly clean and the shower pressure was great - it looked new! Note that the door to the bathroom is clear glass so there isn't any privacy if you have a guest in the apt. The kitchen is small and if you plan to cook a lot you may need to purchase some additional cookware. Great wifi!
Also, there's an elevator that takes you to the 5th floor, so you only have to walk one floor which was great when dealing with luggage or shopping bags. The area can be noisy at night but my white noise machine did the trick. Building is well-kept, clean, and safe.