We had a great stay at Eugenia's flat. The apartment is just as beautiful as it looks like in the pictures, a nice space and very nicely decorated. The neighborhood is very lively, with lots of interesting restaurants and coffee shops. It's also really close to the canal as well which makes for a beautiful stroll. Follow the suggestions Eugenia provides you, the ones we tried were really good.
There are several metro stations around and the gare de l'est is only 10 min to walk.
Eugenia was a really good and caring host. But our stay was so smooth, we didn't really need anything.
If you get the chance to stay in St Martin, I can highly recommend this place. I would always come back.