Everybody wants a piece of Paris - so did we. We are happy with Viviana's place but if you have a bad knee, climbing 6 floors can be a bit challenging. We've been lucky - Paris was cool enough during our week long stay (83 highest during the day, June 11-18, 2017). But when Paris turns 90+, don't expect an A/C. Like us New Englanders, they don't have one! The attic setting may also make it harder to install window fans I suppose? Because all windows are rotating up and down, slanted. Also, do bring your own universal power outlet, with at least 4 US outlets + 4 USB ports - barely enough for a family of 3! Go to Amazon before you go to Paris! Bring enough underwear or you can hand wash 'em daily - they dry up within a few hours (Gosh Paris was dry!) Between a cheap soap bar and $10 for a decent laundry load, the answer was too simple for us!
We walked to some major places (miles): Louvre (0.6), Pompidou (0.6), Musee d'Osay (1.4), Rodin (2), Eiffel (3), Arc de Triomphe (1.9), de l'Orangerie (1.7), Jardin des Plants (2), Chatelet RER station (0.3) - subway train to places, Office of Tourism (0.7) - board a minibus for a day trip to Champagne Region. Fares to CDG Airport: about 11 Euros/person on RER B, 45 for Uber XL, EuroStar station (Gare du Nord) is 15 for Uber XL, or 25 minutes walk (done both, with then without luggage!) Otherwise, Zone 1 bus or subway is 1.90 Euro/per person/per direction. CDG is Zone 5!
Overall, Viviana's place is perfect for the young and able - go for it!
Or, don't forget to take a boat tour for 10 Euro/person after 9pm! Then go to Terminus Nord for supper. They close at midnight. Ask for a ton of Sea Snails (10 Euro), and a bow of Soupe de Poisson! If anyone finds a better place for fish soup in Paris, I'd like to know!