Expensive, but worth it - 4 BR / 4BA / 3WC (toilet) apartment - split between 6-8 people and it's MUCH less than you would pay for a TINY hotel room (not that those aren't great in the right situation, but for longer stays - that's why we're all here, right?)
Great neighborhood! I loved the 9éme, and I would totally recommend this apartment to anyone heading there and looking for a real Parisian experience in a real neighborhood (not all tourists, though, so brush off a little French when you get here, OK?).
It was clean, comfortable and spacious, great location, and a relaxing stay, for the most part. Easy to cook in, laundry was awesome (They have an AWESOME washing machine AND a separate dryer! That's a big selling point!), close proximity to the wonderful rue Cadet (say hello to Madame Dupuy at her eponymous boulangerie for me) and wonderful restaurants and stores.
If, like us, you are used to sleeping with a top sheet, bring one with you or plan to buy one! How beds are made up varies and this a bottom sheet + comforter situation. The beds are comfortable and the pillows are giant, square and (to me) the right kind of squishy. Towels could be softer, but that's hardly a deal-breaker.
Take advantage of the kitchen and enormous kitchen table for family meals and pile it up with fresh bread, pastries, wine and flowers. Make it your home while you're here - you won't regret it.