When somebody is hired as a PhD student or as a PostDoc in Oxford, a place in a College is offered for him or her. This is the Oxford and Cambridge concept of studying: living in an intellectual, multicultural and pluridisciplinar environment all the day long, in the University & in the College. As an example of how much nice can be life in an Oxford College, here you’ve a link to see photos of Lincoln College, allocated in the heart of Oxford.
http://www.linc.ox.ac.uk/Virtual-Tour
After clicking in each part represented by the different names of the different parts of the virtual representation of the builging, the images will show up in the webpage; is quite cool, because you finish with a really good 3D picture of the College in your mind.
Enjoy it