Thats pretty reasonable, so the whole trip itself for 2 would cost me around $4000 or $5000, u think that is enough
Depends which city you are visiting. Let me give you an example
If you eat lunch in London it's gonnai cost between $3 to $50 dollars depending upon the type of food you like to eat. If you want to go with budget it is possible that your daily cost for food would be $10 with transportation cost of unlimited travel across London for another $12-14 dollars and add accommodation cost between $40 to $400 depending upon the type of accommodation you prefer.
So the bottom line is you are likely to spend
$40 + $10 + $12 = 62 dollars per day if you want really low budget for London or even 500 may not be enough if you are more about luxury.
With similar conditions you are likely to spend around 75 dollars in Paris, 75 dollars in Berlin, 85 dollars in Amsterdam, 60 dollars in Barcelona, 55 dollars in Rome.
But if you are more about balanced travelling then the accommodation costing around 70 dollars is recommend and add 30 dollars for food and transportation per day.
So if you are planning to visit Europe and you are well planned. Imagine you are coming for 10 days, I would suggest your total budget should be
800 dollars for tickets
200 dollars for food
300 dollars for transportation
700 dollars for accommodation
=
2000 dollars is enough for balanced travelling.
If by any chance you want to visit Switzerland, Norway, Sweden or Denmark then any amount can be less since they are very expensive countries.
This is true for 1 person only
If you are accompanied, add 1200 dollars more.