The location was fantastic for us, we walked or took the train everywhere.
The size worked, even though we were a family of 4 - our kids shared the sofa-bed.
Our only surprises were the internet was very slow while we were in the apartment - which made it hard for us to plan - and we found that the bakery downstairs wasn’t open while we stayed. Several other reviews mentioned it, so we assumed we could rely on it for breakfast. Not used to Paris mornings, we found that almost nothing was open in the morning. Perhaps that’s just Paris - we recommend having some breakfast on hand for the first morning if you need to eat quickly when you wake up (like me!). There is a cafe downstairs - the kitchen opened at 10am... we found the ready do go items of mixed quality (although we did use their wifi!).
Overall a great stay and good communication. Recommended.