The tempo is set at quarter note = 104, so play at approximately this relaxed pace. There are two points to note:

• First, the left-hand accompaniment. Imagine a cello and play with the image of sustaining the notes for the entire measure, but never loudly; aim for a soft, resonant sound in the background. All left-hand accompaniment notes fall on the downbeat, which can easily make the beat feel rigid and the music sound vertically segmented. This is not the desired effect, so be sure not to add accents or play loudly, and continuously listen to the sustained notes.
• Another point is the phrasing. Play the first and last notes of each phrase softly. Never begin or end with an accent.

Incidentally, is there a printing error in this piece? The author finds it more logical for the right hand's 4th beat in measure 7 to be F, not E. What does your score show? There are also two different performances on the PTNA channel videos, which has left the author perplexed.