We couldn't have been happier staying here for 10 days with our 2 kids.
We didn't meet Isabelle and her family directly but their friends went above and beyond when receiving us (changed timings, delayed flights, lots of help carrying luggage up the stairs) and made us feel very welcome. The building and apartment itself have lots of Parisian character, with lovely and comfortable furniture. It is very spacious and spread out so doesn't feel at all cramped, and had everything we needed. The apartment is in a fun area close to a fantastic park (arguably the best in Paris), lots of shops and restaurants, with a subway station only a few minutes away.

There were occasional little things from staying in an older place (eg a quirky hot water heater, but the host left us with clear instructions on how to fix it when the light went out and it was simple to do a couple of times during the stay). The kitchen is small but had everything we could possibly have needed, including a great induction stovetop and a dishwasher. We would love to come back and stay here again!