What do you mean by "shared room"? Is that the room
That you rent out has couple beds, that people who don't know each other can rent just beds not the whole room? then occasionally you rent out your room when you are not there?
I have 3 spare bedrooms that I rent out in one house where I live.
For a year and a half I did only 2 rooms with private bathroom each . Then there was a finished garage that was used for old junk and I turned it into bedroom. But now 2 people sharing a bathroom.
You don't really have to say anything about other guests . Let them figure out by themselves if it's important to them.
Most guests expect other guests to be in the house so it's hardly a problem.
I had one guest in a beginning who was really surprised that I have another person besides him. And the reason was that I did not offer him key from his room. That was my first week hosting and I had no clue on how to do anything . This guest told
Me to definitely have keys for rooms if there are other people in the house .
With the garage room situation is a bit complicated as there are laundry machines in there behind curtain and I felt that I had to disclose everything: shared bathroom and laundry situation and other guests.
I was worried how that room will be rented but surprisingly my guests fight over that room and as soon as it was available long term guest moved in there.
My thought with you being away and renting out your room:
1. Cleanliness will become a huge issue especially if they share bathroom.
2. Following house rules will become an issue too IF you have guests who move in and move out frequently.
I travel a lot and when I am away my husband is usually at the house but he of course being at work all day and too tired at night , was ignoring "3 minutes every morning cleaning shared bathroom" rule. When I came home it was incredibly disgusting because 2 men shared it and never cleaned.
Now I am leaving again and I warned my now 2 long term guests who are staying there for months now to keep bathroom in decent condition , take garbage out and take turns in doing this. They are more like tenants now not in and out guests. Even now before I leave I traine them on doing this. My husband also complained that they leave dirty dishes overnight and he ha to wash them in a morning. Now when I am back no one does it anymore because I told one of them that I am
Not picking up after him like I would after a child And if he keeps on doing it he will have to find another lodging.
My advice based on my experience would be to switch to longer term guests for one room who will be reliable in keeping the other guest in line when you are not there and may be give a little discount on rent .