Just back from an amazing week in Paris. The flat was just as described and perfect for my partner and I. We wanted a comfy place to sleep after exploring Paris for the first time and this was just what we were after. The bed is firm and comfortable and the shower is powerful and hot. Perfect after a day exploring. We didn't have any need to contact the host really but she checked in to see if everything was ok and was quick to respond from the initial interested message. The area was lovely, with supermarkets and everything you need. If you like walking you can walk down to the river and along to see most of the big attractions. Few blisters though now :)
It is a bit small to spend too much time in, if there are two of you but if you plan to be out and about and just looking for somewhere to crash, make a picnic to take out then it's perfect.