Tristan's place is beautiful. It's exactly as described: well equipped and very clean. Montmartre is a beautiful neighborhood that'll provide you with an authentic Parisian experience. His place is located between two metro stops - very convenient. Tristan and his girlfriend, Camille, were easy to access when I had questions. The next time I'm in Paris, I'll definitely be checking to see if Tristan has an opening!
Quick tip: just down the block, on the corner, there's a restaurant (Le Brio) that has amazing duck. The people there are also very nice and speak French, English and Spanish. So, if you're looking for some people to talk to and traveling alone, I would check it out.