The Mama really is a hipster hotel. Still I enjoyed staying there very much - and I'm anything but a hipster.
The rooms are rather dark but it's all part of the design - and it works!
Try to get a room further back from the street. It can be a bit noisy at night. There is a night club accross the road.
We had pizza in the hotel restaurant one night and it was very good.
Apparently the restaurant's the place to be for a Sunday brunch feast. The place was packed!
There is a bus station just outside the hotel and since the next Métro station is about 15mins walk away this is a good alternative.
Even better though: there is a Vélib (bike hire station) accross the road.
Cycling in Paris is good fun. Try it!