We wholeheartedly recommend Martin's flat in the Canal St Martin area. We did not meet Martin initially, as he was out of town, but Philippe met us at the door and showed us the important details to get us started (location of water shut off, electricity, garbage etc.). Very friendly guy. We met Martin on the third day and he showed us some of the other details around the flat. He was warm and friendly, offering to show us around or at the least make recommendations regarding places to eat, etc. He provided us with much appreciated slippers, as we did not pack any, and it was nice to have something on your feet in the mornings. He even left a bottle of wine for us.
Everything about the flat is as described. It is nicely decorated and has plenty of room for two. Having the window open and having some bread and olive oil while overlooking the canal on a springtime evening is amazing. There are some great shops nearby and even better restaurants. There is even a Vegan restaurant two blocks over which my wife loved. There is a bakery down the street that has a line up most of the time as the product is highly sought after. It is a short walk to either Gare de l'est or Republique or Jaques Bonsergent (sp?) for access to the Metro. Between these three locations you can generally get to anywhere in Paris either on one train or if needed only one change en route. We liked our stay so much we have already sent Martin an email for us to stay again next year.
My wife and I have been to this area before, so we are familiar with the folks down on the canal until late at night. Martin's windows are high enough quality that most of the sound is dampened, but the occasional yell does make it through. If needed Martin has some ear plugs. This did not impact our stay at all, but then we had the windows closed at night. If it was a hot Paris night it might be different if you have the windows open. Or better yet, grab a bottle of wine and head down to the canal and make some new friends.