Julien's place is an awesome location in Saint Germain des Pres. Having 2 metro stations and a ton of bus options within blocks was great and made it easy to get around the city - we didn't take a taxi once!
His place is a modern minimalist oasis in an old-world building. The beds were comfortable, but I do have to agree with previous reviewers, a bit loud from the sleep sofa. The bedroom was quiet with the door closed.
Julien is a wonderful host, who helped us with restaurant recs and directions to the flat from the airport. He wasn't there when we arrived (we picked up the key from the restaurant across the street - a smooth process), but we met him later that evening when he stopped by to make sure everything was okay.
I highly recommend this place and would stay here again and again!