You've received a letter from your English pen-friend in which he/she writes to you about his/her last journey and complains about his/her travelling companion. Write a letter to your pen-friend in which you tell him/her

where you travelled last time and who was/were your travelling companion/ companions;
what kind of travelling companion you prefer and why;
give some pieces of advice on how to avoid conflicts with a travelling companion when you travel.
Write a letter of at least 100 words.