As first time visitors to Paris we had a wonderful stay at Chloé’s place in the Bastille as a party of 4 including an infant! The positives I'd like to note for future travelers would be:
Location - The apartment entrance is ~30 feet from the Bastille metro exit! The flat is inward facing on the top floor which means it has plenty of natural sunlight and fresh air from the windows. This would be a problem in a building with only stairs but thankfully there is a modern (but tiny by American standards) elevator. Bastille itself is a central hub for several major streets and makes it extremely convenient for bus travel as well. This also means you have many options for food, entertainment and shopping within the local area. Travelling with a stroller & luggage, we found it far more convenient travelling by bus than metro to avoid stairs. (Note: The 69 bus line takes you all the way to the Eiffel Tower passing by almost all the major sites on the Seine!)
Cleanliness - The flat is very well kept and not a speck of dust was found. The bathroom was clean and fresh.
Furnishings - There is plenty of lighting throughout the flat to keep things bright. There is a basic modern kitchen including refrigerator and freezer. Also useful is the washer/dryer unit for which a single laundry detergent pod was provided. (Note: It is a typical smaller unit found in Europe/Asia and will not dry your laundry properly if you overload it.) The bed was comfortable and the futon/sofa was a typical model you would find from Ikea.
Communication - Chloe was quick to respond to any questions we had and provided clear instructions on where to meet her friend Tom to check-in. Although he does not speak English, he was very kind and straightforward and made checking-in a breeze. Checking-out was as simple as locking the door and placing the keys in the mailbox on the way out.