The flat itself is practically brand new (we were the first ones to stay there). It has all the basic amenities and a full kitchen. The internet is super fast and there's also cable TV with English channels (for when you get tired after walking around all day). Communication with Sonia was great (she always responded quickly). We didn't meet her in person, but the check in and check out was very smooth and hassle free.

The location of the flat is great. 10-12 minute walking distance to all the major sites (Notre Dame, Pentheon, The louvre etc). And still not in a super touristy area as the restaurants etc seem to be better priced and where actual locals hang out. There's a few grocery stores around the corner to get your everyday essentials. The last 2 nights there was a water leak in the ceiling due to the upstairs neighbor. Sonia refunded those nights right away when I told her, so that was great.

There is also a sofa bed in the living room in case you're more than 2-3 people.

All in all a good experience and definitely recommended for those visiting Paris and want to be close to all the sites.