In this paper, we have gathered arguments that provide evidence that soft X-ray regime could be of interest to this community as well. In addition, we have presented some of our experience of STXM studies on organic-inorganic perovskites solar cells highlighting the utility of this tool, the limitations and some words of caution. The objective is to present the technique to new users with some examples, hence an experienced STXM user might find some of the information trivial. The paper has been divided into two sections. Section I intends to elaborate different steps and considerations for preparing and performing STXM investigation of these materials as well as analyzing the obtained data. This section is interlaced with simulations and experiments of these materials. Section II presents a brief interpretation of STXM data on FA1-xMAxPbI3.