Helloguest manages my flats in a building block in London for airbnb lets. They are providing a full management service as I don't live nearby or have the time to manage it. I used to rent some of the flats for long term tenants but have found short lets gives better returns and fewer problems, I had a particularly bad long term tenant who stopped paying the rent and had to get them out which proved to be very costly and stressful. Overall would recommend Helloguest, they have been very professional, responsive and available to arrange appointments for the building maintenance when its been needed.