We had a great stay in Thierry's apartment. The space isn't large but it has been ingeniously fitted out with everything you could need and it feels far more cosy than "small".
It was perfectly located for us to visit the Pompidou and explore the Marais - we could actually see the Pompidou from the back window.
Despite the central location it faces into a quieter street - it felt private and we had no issues with noise.
We would absolutely stay again.