Dear Michela , 1st of all about the elevator you should ask before you made any reservations, that's why you made a mistake even for the payment in the begining, and as a B&B owner in Rome you should know about it.
2af all the apt is perfect for 4 people, 2 in a bedroom whit a standard double bed, and in living room whit a sofà-bed born to be ideal for 2 people, probably you never saw small bed I guess.
You always can find clean and fresh sheets on the sofa-bed , the simple reason is because during the day is a SOFA, and when you ready to get sleep become a BED,and nobody will prepare your bed once you are in.
If you want to find beds already whit the sheets on, I suggest you next time to book a 2 bedroom apt, but remember that nobody will do your bed in the living room. I even suggest you to read and pay attention when you read the description's because isn't write that you got a closet, but a white dresser, and bedside.
If than we want to talk about your arrive I can say that I made a great favor waiting for you till 6pm of the day after of your booking, but I didn't complained.
I don't want even say anything about how you left the condo,totally mess and smell around,and so deep dirty everywhere.
As result I absolutely don't recommend these people to anybody.
Thank you for your stay in our apt, you really good persons,and I found the apt when you left in good conditions, I would like to recommend you to everyone.
About the towels I left 4 big one and 2 small , and by my opinion for 4 people is more than enough.
About sheets I left 1 for each bed plus 2 blanket.
Thanks for your review.