I like horizontal top tubes.

All 3 of my horizontal top tube bikes just barely touch me when I stand over them. In the old days, we used to judge the standover to be good if you picked the bike up and mashed it into your soft tissue so it finally was stopped by your pubic bone; and if the tires were at least an inch or so off the ground, we were happy.

If everything else about the bike fits, I wouldn't worry too much.