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If the text is threatening in his tone, I'd say, the police. Some hotels appear to resort to "scare tactics" as described in other threads, e.g. the fake policemen turning up in the middle of the night, asking escorts to leave.
It would be interesting to know what CAB will have to say. You paid for the apartment and you only "invited" clients, maybe, 1 or 2 per day. That's very discreet. Wouldn't that be within your rights to do so?
Did you put your details on "tour" on AW? There have been some posts where there were suggestions for the hotel managements checking these. Hard to believe that they got so much time doing that type of extra "research" on escorts sites, though. If my memory serves me correctly, AW was specifically brought up by the hotels (?).