Marina's studio has been a real cozy local experience: getting up and down the stairs, using the metro "n" times a day, discovering the different faces of Paris.
The space may be tiny, especially when you are a couple, but there's everything you need for living: kitchen is well equipped (fridge, little freezer, two stoves and a microwave/traditional oven).
Really close to two metro stations (different lines, here it stops a nightline too) and young nightlife area, that it's a great plus. The area around is quite multiethnical and full of services.
Don't get scared of five floors on foot, after the second day you will forget that.
For position, ratio quality/price and "living like a local" experience, this place is definitively a bargain.