The Hoffman ep wasn't a light bike. But neither was ANY complete bike from about 5 yrs ago. Just get it & deal with the weight - you'll adapt.
The TT is most likely 18-19" if I recall.
While the bike is still a good deal at $75, keep in mind that the seller is lying in the description. Those are NOT Primo Powerbite cranks. I suspect he has a low-end EP complete & is claiming it is a high-end EP complete. If this is the case, it may not have a freecoaster either.
Still - at $75, not bad. If you're just starting out in flatland, a freecoaster isn't quite as important.