First Floor is above ground floor, they are not the same thing.
Yes. From the Cardiff Residences website,
"Your online Offer of Residence consists of the following information:
Residential Terms & Conditions
Paying for Residences Guidelines
Once you have accepted your Offer of Residence, your room will be reserved for you and you will receive an email confirming this.
You will be offered a place for a set residential period and once you accept your Offer of Residence, you become liable for the fees and associated charges for the residential period stated on your Residences Agreement."