Jan's apartment is beautiful! It's located in a lively area with lots of places to eat, drink and relax, and is ideally situated for exploring Paris. There are a number of metro stations within walking distance which will take you everywhere you need to go - all the big sights are within 20-30min ride.
The beds are especially comfortable, and the kitchen had everything we needed for breakfasts/lunches at home and some light cooking on occasion. Checking in and out was really easy and smooth, and the letting agents were really helpful.
We were lucky to meet Jan himself and he was a great host - friendly and chatty. He lives in the area and had some great tips for the best places to eat nearby.
Overall, a great stay - just prepare yourself for the hike up three flights of stairs after a long day sightseeing :)