There is no Picnic here. None of the mailboxes of the building (https://www.openstreetmap.org/way/267996196) is labeled Picnic.
The Picnic might be somewhere within that block, but the access to the terrain is prohibited, so I couldn't check there.
https://picnic.app/nl/locaties/ shows Picnic at De Werf 11, but it couldn't be found there as well.