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Google Trips is probably where they are trying to push you with the automated bundling for that type of stuff like Flights. [link]
I've had that problem too. Google's automated flight notifications are hit or miss. I use Google Trips so I can modify things or add things they missed.
If you're just visiting, there is also Google Trips, which allows you to plan your travel around your points of interests, and which also works offline.
I'm not saying you will spend it all, but lots of things can happen in 3 weeks.
My 2 cents is to start by buying your In-Europe, Out-of-Europe tickets, so you'll know what dates you're working with, then scheduling flights/trains/buses, so you lay down the order by which you will be moving between countries, and then do your AirBnB/hostels research so now you're just left with the things you'll do...
Plugging Google Trips too just because of the damn convenience of having your flight tickets, hostels, and things to do/eat in one app
Are they going to get rid of Google Trips? I use that app a lot and its super handy!!! I gets my flight, hotel, and car rental info from my email and pulls out all the important stuff so its handy and ready to go. I hope they keep it around.
As a native, I can tell you with confidence that Google's "Trips" app covers most of the tourist hotspots very well, maybe give that a try!
It also includes the most accessible part of the Alps from Graz, the Schöckl, under the "farther away" section.
There's absolutely no snow whatsoever in the city right now, maybe in a few weeks.
I hope you have a wonderful time, if you ever wanna grab a beer just PM me!
Actually, Google has a very useful apps "Google Trips."
The app give you all-you-need-to-know information about cities and show your booking hotel location and boarding pass. But there is no information of unpopular cities.