Last week I stayed one night in an hotel in the 11th arrondissement of Paris close to Nation : Le Patio Saint Antoine that is an hotel from the Best Western group.
It is a super lovely hotel I recommend to people on a budget. The room is pretty simple, but you have all you need and even a little kitchen if you prefer to cook something rather than going in a restaurant.
What really surprised me, was how green the hotel was. It has a lovely garden. And in my room I had the feeling I was outside when I opened the window.
Perfect for someone who looks for a quiet and green place in the heart of Paris.