I think it's up to the buyer to know what size frame he/she needs. Giving out info about who would fit this bike is a bit of a gamble for a seller. This is because people who are the exact same height may have very different bodies. For example, two people may both be 5'8", but one could have very long legs and a short trunk, while the other could have a long trunk and short legs. As a result, the same bike may fit one rider perfectly and the other rider badly. The seller should provide the basic information about frame size, including seat tube length (which is usually the "official" frame size), top tube length, and standover height, and then it should be up to the buyer to determine if the frame will fit them. If they insist on an answer, I would tell them something like, "Well, the previous owner was (whatever height they are) so it should work for somebody in that height range, but I cannot guarantee proper fit."