Visiting Budapest / meet for a drink ;)

Hello dear friends,
I'm Marija from Budva, a beautifull touristic city by the sea in Montenegro !
Coming to Budapest on May, 10th for 4 days holiday :)
I booked an apartmen in a city centar (District 5 ).
Any advice, tip, suggestion on what to do and where to go around (restaurants, clubs, wine bars...) and other parts of the city , or where NOT to go ? will be much appreciated and welcomed.
Would love to meet locals, and open mind people living in Budapest and return a favor - could help you to discover Montenegro beauty ))
Thank you so much :)
Hope to see you soon !
Best regards,
Marija