What are the benefits of working in large(lets say multinational or with many staff etc) company?
In a small company?

What should an employee prospect to find in large or small company?

Any advantages or disadvantages, generally speaking?

Just the same as your home world, but with higher salaries and way higher cost of living.

Often large companies have good packages that smaller companies cannot afford. Large companies may not require fluency in the local language, English might be enough as long as you are doing a language course (and therefore show interest in staying the long run), they might even pay you to do one (mind you, this is worth asking for even if the company is small).
And as for the benefit of working in a small company, as the previous poster has pointed out, it is like in any other country, I guess: feeling a "part" of the company where everybody knows each other and having "intimate" Christmas dinners

As above and...

Small company:
- good experience being exposed to various elements of company's operation
- you are more indispensable (at least it feels like)
- longer working hours as you have to do the work for few people
- opportunity of being more creative as the future of company vastly depends on your initiative and you are building block of small organization
- more pride in your work as you feel you are running the show
- less opportunity to change position and most likely you will stay where you are
- they make sure you always deliver
- there is one boss and he is always right so do not feel offended when you are patronized
- you think you are on holidays try to switch off the cellphone

Big company:
- more benefits and they are likely to deliver what they promised
- opportunities to rotate from one position into another and promotions
- usually longer holidays and regulated working hours
- you can bugger off on holidays whenever you want to as there will always be someone in the office
- you most likely will do the same dull tasks for unlimited period of time
- you must fight to get exposed (in positive way) or shine to be considered for promotion
- if you stay too long there you will become too lazy to start your own business and most likely loose the drive

and many more...