There are indeed various interpretations of this second movement, but I will offer my personal view.

I believe it is important that it is marked Andante. This is not about the actual metronome tempo, but rather that it is crucial to play it so that it sounds Andante. Therefore, if, upon listening, it sounds overly lively, mechanical, or if the sections with small note values sound too busy, I would argue that it cannot be considered Andante.

Consider it as a scene from an opera. For instance, imagine a tenor singer, and set the tempo such that the passages with continuous sixteenth notes, like measures 18-19, can be sung effortlessly.

Once a tempo is established that allows for a leisurely listening experience, try to differentiate between the vocal parts and the orchestral parts. For example, imagine a soprano singer beginning to sing from measure 1 until the first beat of measure 9. From this point, the orchestra enters tutti and plays the theme for two measures. Then, the singing resumes from measure 11, and a tenor singer appears from the end of measure 15 and begins to sing – this is the kind of idea.

Please consider it a very peaceful and graceful aria.