Now, i am in salary negotiations stage. What is the salary that I should ask to have a nice stay and save some.
The worst way to enter the salary negotiations stage is to respond to their request for your opinion of what you should earn. Always make them be the first to mention a concrete figure, or else you lose. And keep your limit hidden from them. Don't ever give in for fear of being impolite or of not getting the job. They will lose all respect for you and know that they can fcuk you over whenever they want with impunity because, basically, you gave them permission to.
Also, don't be afraid to just hang up the phone if their offer is too low, say less than 75% of your hold-out price. If that's the case, negotiating is a simple waste of time for you and them, because you will never be able to bring them up into the range that is acceptable for you. A quick hang-up without bothering to even say goodbye sends them the clear message that they have crossed the line, and if they do call you back, that shows that they value you more than their initial offer. So you're in a much better position.
It's better not to take a job at all than to take one from an employer who takes advantage of your weaker position before you even sign a contract with them.