1- Passage on left side is an patio in fact or open to sky area from ground till roof for air ingress/circulation and sun light provision. House was designed in a way that during day, day light would be enough, there is no need to lit a single light even during day.
Actual Picture of Side Patio/Open to Sky Area/Passage Ground Floor Lounge Side PATIO
Center Patio Actual Snapshot . That's the Patio between Master Bed, Kitchen, Bath and Patio Entry is from Lounge.
2- On ground floor master bed, cupboard was part of bath, have a look on plan again. Similarly on 1st Floor front bed.(Refer to Pic 1)
Pic 1 (Pic Taken while standing outside bath and cupboard is part of bath)
At 1st floor master bed, cupboard was adjusted in bath space with its opening front in side room. Have a look on below pic;(Refer to Pic 2 & 3)
Pic 2 (Red marked area, Cupboard provided in red rectangle area and was made part of bath infact so that room view shall be looked as leveled with wall)
Pic 3 (Final Finished Picture of Cupboard in above case)
Hope above clarifies your question. THANKS!