If all utilities are not included in the rent, call the utility company to find out what the last tenant's monthly bills averaged for water, electric, sewer and gas. This will give you an idea of what the costs will be for you. This will be helpful for you as you develop your budget. Many apartments don't allow pets or smoking. If this is a need for you, be sure to ask before you move in because you can be evicted for disobeying these rules.
Some apartments only allow one person per apartment.
Some will want extra money for more than one tenant. Some will want all tenants on the lease. Some will even want to approve overnight visitors. Be sure to ask. In larger cities where parking areas are crowded, there may be designated parking only.