bathroom vanity heights seem to have undergone changes lately.
typically a vanity height was around 32" but now are upto 34" and even 36" above floor.
also height of vessel makes vanity even lower.
If 32" is comfortable for top of vessel, subtract the depth of vessel to determine vanity height, ie: 32" - 8" vessel would be 24" vanity height.
again, this comes down to a personal preference...

when using a 6 inch vessel sink how high would you mount a waterfall wall- mounter faucet??

its the kenzo wall mount faucet by pfister