To collect qualitative data, you must interview at least three people who live or work in your neighborhood who are willing to express their opinions about the cultural/social/economic changes happened in your neighborhood during the last ten/fifteen/twenty years. You may interview just about anyone in the neighborhood about this topic (that is, how your neighborhood changed from every viewpoint). Your task, then, is to collect information from them and present their point of view, accompanied by your analysis.
Your own observations should be used to write a description of your neighborhood that will help the reader understand the attitudes, orientations and opinions expressed by the people that you interview for the study. But the paper cannot be primarily autobiographical in nature. The paper will be basically based on semi-structured interviews (or open-ended) questions, which ask respondents to answer in their own words.