Solo - definitely D or E seat - not row 23.

I am 183cm and with bean bag fitted fine.

Just to note that on my last PE flight, the load was light and the E occupant beside me moved an empty pair.

I was told by the CSM that I could try sleeping flat on the center pair curled up in the fetal position - worked ok, every hour or two I'd wake up and reverse direction to sleep on my other side.