Most of the hotels in the chains you mention have not opened reservations for June 2017 yet. Hence no availability showing for cash or points.
Your best bets are the chains that have more hotels in the three cities you mention. This probably means Accor, IHG, and Hilton.
As to which chain offers the best deals for you will depend on your home country and what offers are available through the chains and credit cards.
Keep an eye on what points are required as rooms become available.
You may need points in your account before you can book with points.