We love staying at Fabienne place (this is our third time), it has literally become a home away from home. My wife and I are frequent visitors to Paris, having stayed at many place other places in Paris, we have landed firmly in St Martin. Its a 10-12 min walk from Gare DuNord/Gare De l'Est. Located in a very quite and peaceful place by the Canal St Martin.
It is a lively area, and very central to all of Paris, though Eiffel maybe a little stretch to walk but there are metro/buses 7/8 mins away.
Locally you have a Franprix for groceries/wine etc...
There are a lot of excellent places to eat nearby but I recommend La Marine for wholesome French meal.
Fabienne provides a functional place to stay and a fully working kitchen if you fancy cooking at home. We love the power shower!!!