The good: Laura is a wonderful host, responsive and attentive. The studio is renovated with good taste. It is very small and can be comfortable for one. Shower had plenty of hot water (other guests complained, I had no issues).
The bad: The studio has no windows, external ventilation exists via an air duct and a fan). The location is central, however, one should be aware that it is off of a not so pleasant part of rue St Denis where there are several sex shops and strip clubs and also in a side alley that some may not feel comfortable walking in at night (it is well lit, just very long and narrow). Lastly, I later found that the total price paid (including cleaning and service fees) was $10 per night lower than a high floor with windows hotel room around the corner which includes breakfast, so price was not competitive.