Starting our month long Portugal trip with 4 nights in Lisbon on April 12th. We really like to go to rooftop bars with views and a nice vibe, especially if they have a light food menu. Any recommendations? We're staying at the Avenida Palace. Ditto for Porto where we're also spending 4 nights at the Portobay Flores. Thank you!

VIPExecutive Eden Apartment hotel Lisbon has a roof top with fabulous views

The Sky Bar and Seen in Lisbon.
The 17º Restaurante & Bar in Oporto

... across the street at the Altis Avenida (only open to AA hotel guests Monday and Tuesday)

Great recommendations! Thanks everyone!!