I would highly recommend Franck's apartment!
The view of the Eiffel Tower each night was magical and the apartment is located within a vibrant part of Paris, with lots of bars/restaurants/shops to choose from.
The nearest Metro is not far at all and we were welcomed on our arrival by a lovely woman who spoke perfect English.
The apartment itself is extremely stylish, comfortable for two people and very clean.
It's the perfect place to retreat to after a day of exploring :)