I don't think the guys with the bad reviews below know what they're talking about or they have the wrong agency.
I used to rent from them for 2 solid years and i got nothing but excellent service.
In 1 property i had a problem with the boiler phoned them up and they got a guy in the next day to fix it.
Rented 3 properties over the 2 year period and only 1 of them wasn't up to scratch, had a chat to them and they got the rent reduced (a little) and sorted out the issues.
They're not like some of the other cowboys i've dealt with, would definitely recommend using them.