You have to ask yourself, how much has the agent spent on travel costs, picking you up from the airport, taking you to various properties, and returning you to the airport and how much of his or her time has the agent invested on all this, and what does he or she expect in return?
Ask yourself, to what extent will the agent be looking after your interests, to find you the most suitable property at the best price and to what extent will the agent be looking after his or her own interests, to promote the property which will generate the most commission, to the agent?