Our family of 3 stayed at Leontine's apartment for more than 2 weeks and found her cozy canut (loft style) incredibly well-equipped and incredibly well-located. It is a pleasant and comfortable home, and there are many small touches that Leontine provides to make your stay truly great.
Leontine has done a wonderful job of thinking through what guests might need in a "home away from home" and has kitted out the apartment accordingly. There are plenty of linens and towels, a full kitchen with dishes, utensils, and everything you'd need for cooking, preparing, and storing food, along with little touches like tea, basic condiments, etc.
Though the apartment is on a commercial street at street level, it is very quiet all throughout the day. And the back half of the apartment, where two of the sleeping spaces are, is adjacent to the interior courtyard and it is completely silent. You will sleep well!
Leontine herself is a very warm and lovely host, and was incredibly hospitable, though was in no way intrusive.
Finally, the location is excellent in two ways. First, Croix Rousse itself is a wonderful Lyon "home base." It's high on the hill and has the feeling of being in a village in the middle of the city, supremely walkable and with great access to public transit, and close to all the city sites. Though be warned that you might find it hard to leave the immediate neighborhood because it's so charming. And then second, the apartment itself is just perfectly located right in Croix Rousse. It's on a cute street that has everything you need for daily life - boulangeries, traiteur, boucherie, grocery stores, pharmacy, patisserie, fromagerie -- all within a couple of blocks. But it's not such a main street that you have the traffic and noise that comes with that.
In sum, I highly recommend this apartment as a great place for long or short stays while you are in Lyon!