Blandine's apartment is a great option, especially if (like we did) you're leaving Paris out of Gare de Lyon. It's close to the Promenade Plantee, and has excellent transport links. The best thing was Blandine's thoughtfulness. The room we had, with en-suite shower, was more than spacious enough, and the shared toilet was fine. Our train left at 7.15am, so we didn't expect breakfast, but Blandine served us coffee, juice, a basketful of breads, jams, Nutella etc. and fruit... at 6.30am! It was exceptionally kind and turned out to be vital. Our five-hour train had no food carriage, not even coffee. Thank you Blandine!