If you want a storybook experience in Paris, this is the place to stay. The windows overlook a cobblestone market street that can be traced back to the Romans. Every morning you'll smell the bakery prepping the baguettes you'll eat later that day. The nearest Metro stop is 2 short blocks away, the Grand Gardens are a 10 minute walk, and even Versailles, Disneyland, and the airports are no more than an hour by train. (The 7 runs directly to a major train interchange, so there's only 1 transfer to almost any destination.)
Even though the building dates back to the 1600s, the apartment itself is updated with modern appliances, bathroom, washing machine, and fast WiFi, but without losing its antique charm. Details like the cabinets holding the dishes and the tiebacks for the drapes are beautiful, but they can't compare to the kitchen faucet, made from an antique clock.
Valerie's communication was great. She gave us clear directions (in English) for everything, including getting to the apartment by transit, ideas for sightseeing, and the rules of the place. All of it went perfectly. Any questions we had during our stay were answered promptly.
There is one minor hitch that should only affect a few people considering staying here: The stairs from street level up to the apartment might be original from when the building was built. If you have mobility issues, or very large luggage, they will be difficult to navigate. We had no problem with them, but they could be a barrier for some people.
When we come back to Paris (because a week was definitely not enough time), I'm sure we'll try to stay here again. We had high expectations based on the pictures and the description and it did not disappoint. It is a great place to stay at a great price.