Sun's studio flat in the Marais is perfectly located for exploring Paris. It's walkable to the Louvre, Notre Dame, and other key areas, and the nearby St. Paul metro station lines will take you near the Trocadero and L'Arc du Triomphe.
Excellent shops and restaurants are right outside the courtyard, though you don't hear street noise from inside the flat.
The space was plenty for two people. The bathroom is well supplied with toiletries and medical essentials.
I'd definitely stay here again on my next trip to Paris!