We stayed at the Langlois for four days in the first week of August having seen excellent recommendations on Tripa Advisor.com.
We were very pleased that we did. The hotel was exactly as other customers had described it. The staff were friendly and courteous; the room was spacious and spotlessly clean; the breakfast was great; the hotel itself has a lovely atmosphere and it's just a short walk from the Trinité d'Estienne d'Orves métro stop.
We have since recommended the hotel to several of our friends, some of whom had rather grim stories to tell of other hotels!
In addition to the hotel itself, we found the reviews on this site to be really helpful. We won't be booking another hotel without consulting this site first!

We stayed at the Hotel Langlois (August 2004) on the recommendation of other trip advisor reviews. We loved it! The location was great for the metro and a close walk to the L'Opera area. Our rooms 12 & 14 were large, especially for Paris, with bay windows and clean bathrooms. The staff were pleasant and the hotel had loads of Parisian Old World charm with modern conveniences. I would definitely stay there again and highly recommend this hotel to anyone travelling to Paris

A really excellent small hotel in a very convenient location.
Good matter of fact service with no obsequiousness or indifference and really athmospheric room (64,on top of the house with Sacre Coeur visible in the early morning sunshine above the surrounding rooftops).
If anybody is used to the US style chain hotels then the Hotel de Langlois is NOT for you, but if its individualism at an affordable rate then it should be near the top of any consideration list.
Downsides...... While breakfast is a good buffet spread, the FRESH fruit is in fact processed from a tin stuff.
If U can live with that then away you go....
I certainly would stay here again.