雅思口语P2 Describe a time you received a call from somebody you don't know(文字版）

Mention about the subject, a call that I received from someone who I don't know comes to my mind. Last weekend, when I was sitting and studying in the central library, I received a phone call like that, I felt like quite nervous at the beginning cuz it was not allowed to use phones in such a quiet place. Meanwhile, I have never seen this person before, he got my phone number on the Internet the other day, when I was looking for a proper place to live in. You know, I left my phone number on certain websites or forums. Actually, I decided to rent a big house on the suburbs, where I could totally rest my mind. I told him what I want and other requirement of accommodation. Such as the maximum price each month, the preferred starting date or such. We didn't talk too much. Like 2 to 3 mins. Two reasons, No.1, I even didn't know him, I shall be careful. No.2, I was staying focused on my academic study then, I was not likely to be distracted. So, that is the first time for me I could say. That is it.