The flat is great, I can’t think of anything that could have been better.
You can expect the place to be clean, tidy and easy to use.
As for the location, it is close to the metro (1 min by walk) and its a popular line with Gare du Nord, Chatelet and Montparnasse.
You can even walk to Opera in about 30 min.
Antoine was easy to reach if I needed anything and its no bother!
It was perfect for me, I strongly recommend.