Good news! Coffeeshops in Amsterdam and the rest of the Netherlands will fully open again from July 1st.
Coffeeshops were still open for take-away, but from next week they’ll be allowed to offer seats and full-service again. Bars and restaurants in Amsterdam have been open since the 1st of June and, although earlier the government decided coffeeshops had to wait until September before they could reopen, it looks like there is no reason to keep coffeeshops closed any longer. Standard measures against coronavirus (such as the direction to keep 1.5 metres distance from each other) still apply.
Update: New Corona Measures: Coffeeshops Open Till 8 pm For Take-Away