Best coffee shops Notting Hill work better as a morning route: choose a serious cup before Portobello, a proper sit-with-a-laptop stop, then leave with a coffee-and-walk exit instead of another generic list.
Start outside the Portobello crush; Amoret is the serious-cup move when you want coffee to be the point.
Lift is the more sensible longer-stay choice, but a laptop is not a reason to occupy every good cafe all morning.
Notting Hill beer gardens work best as an afternoon with an early stop, one proper outdoor destination, and a controlled exit before Portobello starts directing the whole day.
Start away from Portobello, then use it as a short crossing rather than the whole afternoon.
The Elgin, The Windsor Castle, and The Prince Albert are the proper outdoor destinations; choose one.
Things to do in Notting Hill beyond Portobello Road: coffee, books, Holland Park, pubs, and quieter local corners without getting swallowed by the crowds.
Use Portobello Road as one part of the day, not the whole day.
Start early if it is Saturday; late Portobello is mostly elbows and regret.