The flat itself is fantastic, tastefully decorated and well laid out, small but with everything you need if staying in your own or as a couple. It is close to Montmartre and its close proximity to Gard du Nord and numerous metro stops makes it a great base for exploring the rest of Paris.
Alexandre was a great host and gave us loads of information about the surrounding area which we put to good use. He also left us things for breakfast, as well as a bottle of wine, and was on hand in case we did need to contact.
I couldn't recommend this place more highly!