Stay away from Grant Management 🙂 Even though I did get most of my deposit back the flat was rented out with me agreeing for open viewings between certain time, so people would come round and view the flat. Someone rented the flat after that viewing so I got £75 extra, however they charged me for cleaning the flat and some stupid cuttlery and plates that were all there as I checked it £82, so all in I didn't see the extra £75… My other friends, 3 quiet girls, cleaned the flat spotless, somehow Grant Management managed to put 3 people there and make them clean the flat for 4 hours and took over £200 from the girls deposit. Thieves. Plus the flats are bad most of the time.
Next flat was from a private landlord and that was good (found it on Gumtree) worth checking as well but again it can be hit and miss. My other friends had surprise visits from the landlord to check up on them. I on the other hand stayed in the flat for 3 years, saw the landlord twice, everything was always sorted on time and I got my full deposit back no problem.
I recently moved and now I'm renting out from Southside Properties and right now it seems ok after nearly 3 months. Prices are good and they don't charge You with that stupid £200 extra on top of the deposit. No stupid lease agreement like in another agency where I felt like I need to provide them with references from my grandfather or the Queen or something.
Check the internet for any reviews but You may need a bit of luck to find a nice and well priced flat. Check private landlords as this may sometimes be better than renting out from an agency.