Valerio You can export a bank statement for every sub-account of your choice. This includes your full name, address, IBAN and a stamp + signature from bunq. Just go to them Home tab > choose any account > then open the MENU > and there click on Export statement. Next you can choose a time frame (any will do for your purpose, but you can choose to only include transactions for a single day for example) and the format. Here you should choose PDF, then click on the button.
Alternatively if you set your phone to French, you can also export a RIB. This includes your IBAN and name on a PDF.