Avoid these agents at all costs - we had such an unhappy experience with Properties Actually when we were requested to vacate our property only 6 months into the tenancy as the landlord wished to carry out building work.
The estate agents from Properties Actually were uncommunicative, obstructive, rude and unhelpful. They were totally unreasonable in all our dealings with them, refused to allow us to communicate directly with the landlord and offered absolutely no assistance in our unexpected (and sudden) property search despite the fact that they had properties on their books that met our criteria.
They were generally unaccommodating and unsympathetic to an array of issues as well as the above: the state of the flat when we moved in, excess household items that had been left behind, mice, breakages etc etc. There was so much more - my advice is to avoid / approach with caution.