@bluesjumper what was the business purpose that required you to be in Europe? if there was none, then none of the travel is deducible. Business travel expenses require you to be traveling from a business location to a business location. That doesn't appear to have occured. That fact that you did work on a computer doesn't mean the travel expense changes from a personal expense to a business expense.
Please review the link and the very first line: Was the travel "ordinary and necessary" to conduct your business? From what you wrote, it was not necessary. While you ordinarily do work on a computer, and meet that condition. you don't need to travel to travel to Europe to do it., so it was not necessary (you have to satisfy BOTH conditions - ordinary and necessary). Hence these are not deductible business expenses.
https://www.irs.gov/taxtopics/tc511
