We had a great time and it was a lot bigger than we thought it would be, based on the pictures we received beforehand.
Since we were visiting Paris in April we couldn't really sit outside, but based on what we saw and experienced of the garden, if we would go back in a warmer season - we would definitely sit outside in the evening!
Lots of patisseries/bakeries/convenience stuff nearby, and walking distance to Sacre-Coeur!