What don't you like about the driving position?
Oh, you haven't heard about that?
Whether it's because the front wheels are far back (due to FWD boxer layout) or the front seats are far forward (to maximise space in what is quite a small car), the front wheel arches intrude into the footwells and force the pedals to be offset and close together.
I'm 6 foot 1 and sit with the seat in its furthest back position, the steering wheel at the top of its travel, and I've fitted a smaller dished steering wheel to give more knee room. I now don't have a problem with the amount of room, but the 33 is not really a car for large people.
How reliable and troubleprone has your car been?
Well actually it has been reliable AND troubleprone.
Check and change the oil regularly, don't thrash the engine until it's warm, never take risks with the timing belts or tensioners and the engine will never give you a problem. Mine uses no oil at 175,000km. They can actually do quite high mileages in the right hands, but will wear cam lobes, lifters and big end bearings (I think) if not kept topped up with good oil.
You'll be kept busy on and off with other bits and pieces due to the car's age and pretty average design and construction though. Or at least I have been, with my older 33s. Nothing surprising to a man who has owned a '70s Fiat I would expect! Most Italian car cliches fit the 33 quite well.
The series 3 Alfa 33 is known for being less rust-prone (though not as good as the 164), slightly sanitised and slightly slower excluding the 16V models - although the example you're considering has had these last two aspects taken care of! Any looked-after Alfa is always worth buying.