A way to do it, is go outside, wipe your wheels and bike, then take a bike, and bring it into your room, all the while remaining confident...
If asked what you doing, answering bringing bike inside.
If asked you can't do that, tell them I need to do this, because I'm not leaving my bike outside to have it stolen.
If there is any other further objection, tell them if you want me to rent from you I will have to keep my things safe, then take your bike and go inside.
P.S. Stop the nice guy mentality. Nice guys don't get laid, and nice guys finish last. Nice guys have a hard life and die bitter old men..