My partner and I currently use Belvoir Sheffield to manage our terrace rental property. We had been badly stung by a previous management agent after then closed taking landlord's money with them, and have found Rick and the team to be a professional breath of fresh air.
Belvoir have been found us some great tenants who will be staying with us for their 2nd year, and who actually look after our property! :)
Can't recommend Belvoir to landlords enough, especially considering our problem with our previous agent; a solid national agent such as Belvoir gives us peace of mind, which is exactly why we wanted a management agent in the first place!