The valuation of a real estate property is not an exact science, far from it! Everyone has their opinion and there can be big differences. Using the services of a real estate agent is helpful, if not essential.
His knowledge of the local real estate market makes agent's strength. With his experience, he is often able to give a price without even seeing the apartment. But a serious estimate necessarily requires a thorough visit.
After this visit, which lasts about an hour, the real estate agent will give you his valuation report, usually within 24/48 hours. This estimate will have been established using several methods, the best known being the comparables method and the capitalization method.