Sarah and Jonathan were great hosts. Communication and check-in was easy and speedy, and they were kind enough to let us check in early upon our arrival in Paris.
The loft itself is small but lovely - very clean, and well appointed with everything you may need. The bathroom is a full-size, American-style bathroom, so no tiny toilet closet and the shower is large. Construction was going on in the courtyard but no complaints about that as everything was quiet in the evenings.
The flat is well located in terms of the metro, train stations, some exciting restaurants, a market, a cheese shop, etc. If you're looking to stay in a beautiful part of Paris you'll walk a bit of a way to find it from this flat, but we didn't mind because the metro was so close it encouraged us to explore further. Would highly recommend this flat to anyone wanting to explore the Canal St Martin area and Paris by metro.