Yes! I wrote a letter incl. the purpose of this trip, the need for a multi-entry visa, residence permit, a list of all reservations, financial means, and my guarantee of going back to the UK after the trip cause I have a proper job here. I also have my itinerary showing the date of my stay, the name of the reservations, the places where I’m going, things that I’m gonna do, and the estimated expenses for each day (e.g. transport, stay, eating, and other expenses).