Mohali Synera buyers: Carpet area measurement tips?

Signature Global Synera Mohali mein abhi shift kiya hai, like 3-4 months back. Possession toh mil gaya time pe, but ek cheez jo mujhe laga sabko pata honi chahiye, woh hai carpet area verification. Jab site visit karte ho na, hamesha ek laser measure saath leke jao. Brochure numbers aur actual space mein little differences dikhte hain, especially for a 2 BHK. Mera flat ka layout theek hai, but kitchen aur balcony thodi chhoti lagi after moving in. Ye log super area dikhate hain zyada, but carpet area pe focus karna chahiye. Daily life mein, wohi kaam aata hai. Noise levels toh theek hain, but air quality ka kya scene hai? Koi aur specific tips for future buyers about measuring actual usable space? Hope this helps someone.