As I have been living in Sitges for more than 6 years I can advice many places.
For example Bars

Central bar and books - Parrots bar - Mans bar - El Horno the oldest bar in town - More to come.

Restaurants To eat and drink based on my taste.

Timo,s Bistro - Parrots Restaurant Sitges - Pizzeria Bella Ciao - Restauran Clares [top restaurant only afternoon]

Cinc Food Parlour - El Palco Bar Tapas - El Pecadito [very good] - Petit Bangkok.

and of course many more places and bars to go too.