However, it's a request, not a guaranteed booking category. Almost all the studios do have a connecting door at Poly, so the chance of getting this request is probably pretty good.
Also, you aren't going to get a washer & dryer or a full kitchen like you would if you booked a larger villa.
Important to accent Where'sPiglet?'s point that it's not guaranteed. My parents decided to piggyback on our last big trip and we had adjacent rooms...but they didn't share an internal door. Not a big problem -- we just used the back sliding doors because we were on the first floor -- but obviously that wouldn't have worked on a higher floor.
Poly has 360 studios and 20 bungalows for a total of 380 units.
Also, there was a short period of time back in 2017 (iirc) where connecting studios WAS an actual booking category. It sort of just appeared one day, and then disappeared just as randomly several months later.