Don't take any city busses. They are very crowded and the pickpocket people are very active on them.
My husband had his camera stolen on a bus in Rome.
It was zipped into its case, the case strap was crossways across husband's bod, with the camera case part in front, and the whole thing was totally under his jacket which was also zipped.
Try not to get into crowds (ha) where there's a lot of pushing and shoving...pickpocketers love those.
Avoid the 'beggars'...maybe they really are poor, lost souls, and maybe they have borrowed the neighbor's baby for effect and are out to get every cent/Euro you have.
Make good use of the security neck or waist pouch, and have somebody be your lookout when you use an ATM, and you should be fine.