Those are the first things you need to buy after you rent an appartment:
1- A Mattress to sleep on
There are standard dimensions for Mattresses,
Twin : 39 x 76 inches ( 99.1 x 193 cm)
Twin X-Long : 39 x 80 inches (99.1 x 203.2 cm)
Full : 54 x 75 inches (137.2 x 190.5 cm)
Queen : 60 [...]