But since so much of the action of the subsequent scenes takes place upon the aforementioned Blumenbank, I would venture to suggest that any production lacking one, or attempting to substitute some old sofa, would be sadly unfaithful to the composer's intentions.
Indeed so!
A further assumption of the untutored is to suppose that if there are no stage directions at all, then nothing is to happen.
Most of the 'stage directions' are there in the printed score - for those who have ears to hear them, of course ;)