Happy Homes Delhi: My insider view needs ground reality check

Since January I've been shortlisting flats in this city, and honestly, buying for myself is way harder than selling. Happy Homes in Delhi is one I'm circling, the ₹20L-₹65L range fits my budget. I work in real estate, so I know the super area vs. carpet area games builders play. For those who bought there, what's the *actual* usable carpet area like? Are the 1BHK/2BHK layouts genuinely efficient or just look good on brochures? I'm worried about wasted space. Also, off the record, what are the hidden costs post-possession? Maintenance charges, any weird one-time payments I should know about? Is it truly a good home, or just okay on paper?