Hra and home loan

it is advisable if he claims both if the property is not let out  let him give some notional rent in declaration and claim interest so that  it will reduce his taxable income 

Yes, A person can claim HRA even if he has his own house in the same city but he must have sufficient documented proofs (like- Rent receipts, rent agreement, deduction from bank accounts- if paid from bank account) to claim the same.

Thanks & Regards

Diamond Goyal