The property I was renting had been managed by the Landlord directly, but they turned management over to Austerberry while I was living there.
Austerberry carried out property inspections quarterly instead of annually (as the landlord had done), and when I questioned why they were so frequent, I was told that that inspections being quarterly was in the tenancy agreement. It wasn't, and when I told them so, I was told they'd bring a new tenancy agreement for me to sign, and they made a point of saying "we always give you at least two weeks notice".
Each letter we received from Austerberry contained a reminder that they held keys for the property, and this was worded in a way that felt threatening. Fortunately, it turned out their keys didn't work - I was out one Thursday when I received a phone call from Austerberry accusing me of breaching the tenancy agreement by changing the locks and demanding i return immediately to let some-one in. I told them I had not received any notice that any-one was coming to visit. They told me I had been sent notice by first class post on Monday. When I got home, I found that the notice had arrived that day, but had been sent second class on the Tuesday.
This over-intrusive management didn't even help protect the landlords' investment, as although they visited frequently, they didn't do a good job of inspecting the property: they failed on two inspections to notice I had removed a door (I couldn't get furniture through without removing it, and I replaced it before leaving the property), and the inventory had clearly been done without going outside - the inventory listed only what could be seen from the windows, and none of the inspections involved the person doing the checking going outside.
I also had a flood one New Year's eve, and I had to call the landlord direct as there was no-one available at Austerberry, and no emergency number. On another occasion I found a leak in a waste pipe in the evening, and when I called the next day, was told off by the person taking the call for leaving it "too long" and "reporting it "too late in the day".