Jean's place is quite charming and very well placed next to a metro stop. It was very easy to get anywhere in the city or even out to Versailles. Very safe with a coded building entry and keyed unit. It is on the first floor so one flight of stairs and no elevator. Stairs are wide though we had no problem getting the luggage up.
It's a small one bedroom, office and living room. The master bed is quite comfortable. The sofa bed was not very restful with the metal bars pressing against you. Would be perfect for a solo traveler or couple and likely do well for a small family.
Kitchen is small and crowded so cooking dinner was challenging. Though heating something or the need for only one pan on the stove was just fine.
Bath was tiny as was the water heater. Just remember to time your showers to allow it to reheat.
As a host, Jean was very attentive. I would definitely stay again and do recommend it.