I personally would imagine that a landlord, in general, wouldn't be happy with a WG in their property (not to say that there are not exceptions). Unless they're getting something 'extra' out of it...
I think that perhaps the lay perception of a WG remains less than favourable and are probably still associated with drugs, trafficking and crime in general.
Regardless, it is of no concern to me how she treats the property. I am not her landlord and have no interest in her four walls. My concern is the constant coming and going, both in terms of noise and security.
The lift is always going and doors are always banging. Punters, as an observation, do seem to be quite keen whistlers! Especially post punt.
There are three 'landlords' associated with the appartment...the holiday letting company who deal with it day-to-day, the actual owner and the complex manager. I would imagine at least one of these would have concerns so I think I may drop them a line if activity doesn't cease soon.