I really like it and agree that it's more attractive than the current 1er. I especially like the styling on the front hood and it's nice to see BMW eliminated the cut line across the hood a la the F10 and F30. Perhaps a little something for the LCI?
Lastly, I'm guessing it might not make it to the production version, but I loved the suede/alcantara insets across the dash and the base of the seats.
The car gave an impression of being on the bigger side until I saw the guy standing next to it in the Auto Express video. Looks quite small in context.