The studio is very close to the center (approx. 5 minutes from Centre Pompidou) and we managed to reach a lot of places by walking only (Notre Dame, Louvre just to name some).
Also it is close enough to direct RER line (we walked from Châtelet – Les Halles) from the CDG airport so you could easily reach that even when arriving late in the evening.
The studio is rather small, but it could easily fit one or two persons, while providing the basic amenities (bathroom with toilet and shower, small kitchen).
The only thing that could be considered as an issue are sometimes noisy neighbors and the fact that the flat is in a kind of old house, which lacks some sort of noise mitigation. However my wife needed to tell me about "noisy neighbors" as I was sleeping just fine.