We spent a week at Bernards, and we were happy that we did. Pluses: the location is 5 mins to Charles Michels, 8-9 mins to Dupleix in an amazing neighborhood with great bistros (Goya, Xi'an, the modern pancake place..). Bernard is also really kind and helpful and was always there if we needed him. The building feels very safe and quiet. The place is well decorated, clean and has most of the things you'll need.
The only potential downsides were no AC (although the ceiling fan was really good) and the lack of an electric kettle. Also, the room can be really dark if you need it, but I wish the bed was a bit larger (I guess it's around 140-150 cm, which is common in Paris but could be an issue for two larger humans).
All in all, would stay here again.