Here are some tips you could keep in mind before finding an apartment in the UK as an international student:

Do your research to get a general idea of the city your university is in. Also, find out details about which part of the city you would like to live in if you plan on staying off campus. In case you are staying on campus, research the facilities provided by residence halls.
 
Arrange everything before you arrive so that you do not have to face the hassle of finding a place to live right after reaching the UK. Seeking help from your university is the cue for an international student.
 
Find roommates and people who might potentially live with or around you. If you plan on leaving dormitories and finding a place of your own, it would be much easier for you, rent wise if you found a roommate.
 
Make sure the accommodations you choose include everything you need. Go through all possible options to find the right type of accommodation for yourself. Making yourself comfortable in the first few weeks of your arrival is quite important so that you can start focusing on your studies.
 
Collect information about the location you are going to live in. It is essential to know marketplaces, pharmacies, bus stations, and routes to reach your university if you are living off campus.