First of all, think carefully about the type of property you'd like to rent and which best suits your lifestyle.
For example, if you are only there during the week, a small place might do just fine. If security is important, then a ground floor flat may be out. If you have a car, then a parking space is a must.
Do you want furnished or unfurnished accommodation or would something that's just partly-furnished be okay? Often it doesn't make much difference to the rent.
Other key questions to ask yourself:
Is a shower essential or can you make do with just a bath?
What facilities are there for washing and drying clothes?
Does the property have any appliances?
Do you need a garden?
How many bedrooms will you need - normally 2 occupants per bedroom?