We loved Hotel Le Walt, the location is awesome; right next to Rue de Cler and the Eiffel Tower is only a short walk away. The hotel itself is beautiful inside and out, the staff were always top notch. Dead silent at night. I've been to Paris three times now and this would be the hotel I would return to if I come back. I wish all of my hotel experiences could be this clean and polished.
I do have a few issues that are minor: the bathroom faucet was very strange, operating differently every time we used it. At one point the whole faucet handle popped off in my hand, but it just popped back on and still worked, although weirdly. Lack of an iron in the room. Squeaky bathroom door. No bathroom fan that I could find, but that seems common in hotels. Bathroom fans are very important for privacy. A few more electrical outlets or USB options would be a nice touch, but we made do just fine.
Those things aside, we thoroughly enjoyed our stay and would happily return. We both agree Hotel Le Walt earned very high marks.