Antoine's flat is a delight. There were three of us staying - one in each of the two bedrooms and one on the sofabed in the living room - for two weeks and we loved it.
I walked with my suitcase from Gare du Nord, and found it easily. It's on the fourth floor of a beautiful old block, but unusually for Paris there is a lift! The location is great.. A metro stop right outside and also very near to Republique and all its connections. Canal St Martin with its cool clothes stores and great restaurants is also five mins away, along with a few very good vegetarian restaurants if this is a requirement.
The flat itself is big and bright with lovely colourful eclectic furniture and decor. We had everything we needed and really enjoyed our stay. One point for the shy: if you would have a problem with the neighbours seeing you in the shower, ask Antoine about something to cover the large window in the bathroom! I'm sure it's easily sorted and the apartment is wonderful, so don't miss out. My mornings waking up to the view of the Parisian rooftops made me feel as if I was in a movie.
Beautiful.