Another hack is timing. Often I've taken a day off on either Friday or Monday when I'm travelling over the weekend -- the difference in cost can be as much as a day's wage.
Usually saves at least €100 each way, every time I travel, and occasionally much more. And as a bonus, it's quite nice to spend a day working from a coworking space in a random city elsewhere and see a little of the local working lifestyle.
A coworking space for a single day in a European city is normally €20 or so, but many places offer free 1 day trials too, and there's also 'work from anywhere' portable coworking subscriptions and 'use any of our locations' benefits from multi-city coworking chains, if you/your company already pay for coworking elsewhere.
I LOVE public libraries, but not always set up for working comfortably, especially if I need to take a call, or want to do some whiteboarding.
And lastly, paying for something sometimes makes my appreciate it more - I've paid for this space so I WILL WORK.
Anecdotal for sure, but it changed the way I look at coworking spaces.
Lately though I’ve noticed a trend with libraries becoming… scarier? Even in seemingly wealthy, clean, safe areas, there’s a ~20yo pacing around very… agitated? Drugs, lack of drugs, bad day perhaps - not sure - not my specialty. My conscious brain was saying “it’s fine, you’re in a well-lit public area”
My less conscious brain eventually forced me to move to a spot against a wall, where everything was happening in at-least-peripheral vision.