For the given space, Marie's small studio has been very efficiently designed and is well-appointed: You will have everything to live like a local!
It is on the 5th floor with no elevator, and yes, there are 101 steps. If your regular fitness regimen goes beyond walking to-and-from your car, this will not be an issue. Paris' public transportation is one of the best in the world, but the city's layout is highly conducive to walking. Besides drinking wine and eating small portions, could this be part of the "French Paradox?"
The month of July in Paris is the warmest, but not unbearably so. A fan is available and the two Velux roof windows have pull-down shades. At night, the windows can be left open to let in the cool breeze. Most apartments in Paris do not have central air-conditioning, it would deface the historical Haussmann buildings!
The 8th arrondissement is a great location. Often described as "swanky," it is safe, relatively quiet, and the studio's neighborhood has all the essentials within walking distance.
Just a few blocks away, the Villiers Metro station is your gateway to the rest of Paris. It has a full-service ticket window and automated vending machines that accept cash or credit cards with microchips. You can get a reusable Navigo Découverte card for 5€, load it for 22.80€, and do unlimited travel by subway, bus, and RER through zones 1-5 for an entire week (Monday through Sunday cycles), including the ORY and CDG airports in zone 4 and 5, respectively.
There are several fine boulangeries/pâtisseries in the vicinity of the pad and, a block away from the Villiers station, you will find many other good food options at the Rue de Levis market. If you haven't figured it out yet, the secret to French gastronomy is their exceptional terroir, rich tradition, and copious amounts of butter and cream!
Overall, I really enjoyed my 12-day summer stay in Paris, and the studio's amenities and location markedly contributed to my enjoyment.
Thank you again, Marie!