I wish that people would give the fundamental measurements of a bike frame when they offer it for sale.
Wheelbase - a 39" wheelbase is a "responsive" bike, some would say "twitchy". A 42" is going to be a bit more "relaxed". Fork rake and trail would also help, but I understand these are more esoteric concepts. :-)
Stand-over Height - seat tube length is meaningless unless it is tied to a bottom bracket height and wheel diameter. What is critically important (to the family jewels) is stand over height. To some extent, I could care less about top tube length (within reason), as I can fit the bike with whatever stem length is required.
Frame's wheel size - absolutely essential to know so one can understand if they have the proper set of brakes to put on the frame. If a frame was designed for 27" wheel but you have 700c, the brakes you're planning/hoping to use may not work. You'll never know until you get your hands on the frame.