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
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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