I sent a cover letter and my CV to apply for an internship and when the internship manager replied, he said that it is great to hear from me and then asked me where I am based. What does his reply indicate, and does this mean that he thought I was eligibl

The internship manager's response indicates that he is interested in your application and is considering you for the position. By asking where you are based, he may be trying to determine your proximity to the workplace or whether you can work remotely, depending on the nature of the internship. This is a positive sign, as it suggests that he wants to gather more information about your situation before making a decision. While it doesn't guarantee that you are eligible or that you will be offered the internship, it does suggest that he is looking into your application further. If you haven't already, make sure to respond promptly, providing your location and any other relevant information related to your availability or willingness to relocate if necessary.