I'm a great fan of the first section of Y (rows 43-51); I already travelled in 46A and I enjoyed it.
The view is unobstructed by the wing, the purser is overseeing the service (I also had a chat with her) and there are plenty of toilets nearby.
The rear of "bus" instead seems me too dark due to presence of the crew bunk but the view should be nice as well. Probably the service would arrive too late.

My next flight is booked in seat 43K: bulkhead row at the very front of the plane.^