No problem, its not some golden rule you should follow (especially from an internet stranger) but it's mainly bad roads, bad economy (poor police/ambulance availability), the little Roma villages/gipsy makeshift living areas, where I would not show up alone with any valuables (similar to gipsy ghettos near big cities) and last but not least wildlife. While bears and other predators are not uncommon, rabid dogs are also a possibility.

Before somebody accuses me hating Romania (its a beautiful country with incredible landscapes and the capital and developed parts are very popular tourist destinations), the above is also applicable for many other europen countries. This is why I strongly suggest doing some research before planning such trips, as the relative safety and enjoyment of a holiday can vary from region to region within a small country. This is why its borderline impossible to give a straight answer to the original post.