Service costs are maintenance of shared areas, normally this includes cleaning, window washing if you're not on the ground floor, and general things like occasional painting, and maintenance of the heating unit, for instance.
Similarly, the company or person you rent for has to maintain things like plumbing, so if something breaks in your house, call them first and find out if they cover it. They will send whatever company they employ to fix that shit as covered under the service costs.
Whether gas, water and electricity are covered by them or you personally differs from apartment to apartment. For instance, where I live we share a water connection, so we collectively pay for the water bill divided by the number of apartments (Also why I take way too many baths). As said, it all depends on the situation, but expect to pay each for yourself.
In your case I guess you share one house with multiple people, which is why your service costs include all, as well as internet and TV. When you rent an apartment with your own front door, rather than sharing one with others, you are likely to have to pay for utilities yourself.
