thought more in terms of a 6 month let to one person with rent paid and no mixing bussiness and pleasure
Why not as a suggestion if you are near any universities rent it out to students.
I remember at university I was paying £45 per week for one room. And this was the lowest end of the scale. The rents went up to £75 per week per room.
So say you had a four bedroomed flat, say £60 per week per person. Amounts to £280 per week and no risks of comeuppance from the law due to using the flat for prostitution.
And in terms of getting students into your flat. This is simple too. All you do is go to the University students association and they have boards to advertise flats for students for free.