I am on Pursuit right this minute in accessible 737. We were delighted to be upgraded to a Penthouse for a small price increase over Veranda Suite price, but there are some drawbacks:
1. No walk-in closet. Closet is a standard reach-in. That said, it's plenty big enough for everything we brought.
2. Toilet is not separate from the rest of the bathroom. Also, as I'm sure you know, there is no bathtub. Our shower drains fine but our friends across the hall in mirror-image room 738 say their shower floods the whole bathroom.
3. There is a huge carve-out for the stairs/elevator, which makes the suite smaller than most of the Penthouse Suites. Not having ever sailed in a "normal" PH I can't really comment on the difference, although I will say there isn't really room for four people to comfortably dine around the table. Two would be in chairs and two would have to sit on the sofa. We have had our friends visit for drinks and cards and it was fine, but dining would be too tight, I think.
All in all, as I said we are delighted with the suite for the price we paid, but certainly if we'd paid full PH price we would be justifiably disappointed.