If you find a real estate agent as serious as you have described it will ask you to work with an exclusive assignment and with a serious commission and will not be willing to work roughly. This is another indication of his professionalism. Giving him an exclusive assignment is the best way to sell your home by getting the maximum possible and without wasting time on your part.
All this translates into a waste of time for you who will have to ask for work permits, keep the house always in perfect order, waste time. A good real estate agent will only show real people interested in your home, already informed about all aspects of the sale, pre-qualified from the point of view of the ability to buy, saving you time and turning over boxes thanks to Property Development Firms in London.
It will keep you updated with a report after each visit in order to let you know the reasons why your house was not sold to that person and if necessary re-calibrate the sales strategy together.