Goldney, Manor and CHH are all right next to each other, so there are still plenty of students about and more than enough socialising
a lot of the student clubs are on 'the triangle', about 5 minutes walk from Goldney, and Wetherspoons (standard meeting place before going out!) isn't far either, so it's not like the Clifton halls are segregated.
I wasn't in an ensuite, but I really didn't care! Each flat had one bathroom with shower and toilet, one separate toilet and one separate bathroom with just a bath. There was never really any queuing for the shower because everyone had different start times. As a vet you're likely to be the first one up anyway! And the cleaners came every week, so it didn't get filthy or anything. Plus, each room has its own washbasin. Personally, I think ensuites are a nice luxury, but not really worth the additional money. And it's highly unlikely you'll get an ensuite when you move into a student house in years 2-5!
My three criteria for going into halls were:
1) Not at Stoke Bishop (when I was in halls there wasn't a student bus to uni, so you had to walk)
2) Self-catered
3) not single sex flats (which is why I didn't apply to Manor)
One other thing to note about Manor is that it's being refurbished so is actually shut for the 2012/13 academic year.
Edit: When I say Manor is closed, I mean the main building! The annexes with the flats will still be there, students will just have to use Goldney and CHH facilities.