Hello @Irena187
Go onto your listing and click until you see the Photo Tour on your right with a split screen:
==>click on Bedroom 1 and under the photos you can add the size of the bed under Sleeping Arrangements
Go onto Amenities just after that to let guests know what is provided within that bedroom. You'll have a list of things that you can tick. You should do this for all of the rooms showing on your Photo Tour so that guests can see at a glance what is provided.
Do the same process for the other bedroom and then go back to check as a guest via the Preview button to see that it worked!
All the best
Joëlle