Would use different sheets and towels - otherwise the risk is quite low assuming your friend took precautions regarding body fluids and did not have any accidents.
When I was done with isolation I threw away the sheets I used. i also threw away my pillow and got a new one. When you clean the bathroom and bedroom just wear gloves and use a good cleaner, maybe something with bleach in it. Thoroughly clean the shower and toilet, maybe even twice before you use it. Also sanitize any electrical equipment your friend may have used. Like remotes or tv buttons or phones before you use them. my doctor told me after the first couple days the radiation has probably gone through your system already. So just clean the house well. Wish you luck!
Thank you for the response.