Appointment with tax advisor / House purchase with partial donation / Partially rented

Hello everyone, I have an appointment with the tax advisor this evening and wanted to ask everyone what I could talk to him about or what I should pay attention to. It's about the following. I'm buying the house from my father. €600,000 (donation €130,000) The granny flat is to be rented out. Depreciation? Does it make sense to divide credit? Photovoltaic system on the roof with a relatively good feed-in tariff until 2030, which my father will take over. Renovation in the area