Hi [imię]!
Thanks for coming to my birthday party and for the wonderful gift! There were thirteen people in total at the birthday party - mostly my close friends and family. My favourite gift was a new computer game that I couldn't find anywhere and I had been dreaming about playing it for a long time! I am satisfied with the gifts, each one was a hit! It was my best birthday ever. Are you free next week and would like to come see me?
I can't wait for our meeting,
XYZ