I can't answer on the height in the bathroom, but I did not feel too tall in there. Granted, you're taller than me, so don't go 100% on what I'm saying. I can tell ya that there's more room in there to shower than there was in the enclosed shower stall in the 32' Jayco motorhome I rented for a week. So, I know *I* won't have any problems taking a shower in there. But others have stated it's too small for them.
(And cover up the toilet with a trash bag when you take a shower, as someone mentioned in another thread - great tip!)
I'm giving serious consideration to leaving the sink out, installing some holders from RV Widgets and then having ETI install this faucet (to go along with my Ecocamel shower head):
Faucet, Shower, Classical, Satin Nickel DF-SA150-SN