A very warm and friendly welcome by great reception staff, very cosy room, clean and tidy, modern bathroom. WiFi didn't really work but ok signal via 3G.
The Dechampaigne has a great feel about it and it's obviously family run with loads of attention to detail in every room and in the communal spaces. The staff is exceptionally friendly and welcoming, very flexible (could check in 2 hours earlier and check out late without any problem), and fluent in English.
It's a typical Parisian building with rather small rooms, and, as mentioned in many other posts, a lift that fits max 2 adults. The location is pretty much ideal, a short walk to most sights, shopping and nightlife.
Altogether a great little hotel, very convenient and - considering you're in Paris - reasonably priced.