Cozy apartment in an old classic French building. The other reviews are correct that this is like staying at a friend's place or an authentic French experience. The location was great for walking along the Seine or popping over to Ile Saint Louis for more Berthillon ice cream (caramel beurre sale, so good!). Seymour was quick to check in throughout our visit and even left a nice snack for my kids when we got in.
Our only issue was that we didn't see an air conditioner and I had to ask to find it was broken a short while before we got there and wouldn't be fixed until after our trip. Even with the fans provided and shuttering the apartment during the day the apartment was still 86F/30C at 11pm/23h. We found the beds a little hard so between that and the heat no one in my family managed to sleep through the night the entire week we were there. I realize a host can't control the weather but I wish we'd been informed before so we could go in with eyes open or have changed our plans.