Not very safe at all. The Australian government advises its citizens not to travel to Abia state under any circumstances, the British and US governments advise their citizens they should avoid all but essential travel to Abia. They all say this is because of the high risk of kidnapping, violent crime, terrorist incident and robbery.
Nigeria is undergoing a period of great instability and the security situation there is precarious. You'll need to exercise extreme caution and care if you want to go there.
Check with the Nigerian government about visa arrangements. about 7 years ago