My 2c depending on how a bike was ridden and maintained, 5000 km can be a lot! Conversely, a bike with many km's on that has been well ridden and maintained will most likely still give great service for years to come.
So, if you don't know the owner or anything about the bike, take someone with some knowledge with you and evaluate the bike strictly. I do not know what the specific issues are with that model but also finding that out ahead of time will help with your evaluation.
M