Awesome! I also want to create some bedrock mods myself and will eventually get to it. What is your favorite among all the ones you have created?

Besides the polar circles as others suggested, in order to have somewhat consistent temperatures you would have to look for countries within the tropics as they have low temperature fluctuations ("no seasons"). This already discards many places and most developed countries (which comes with trade-offs).

Then, within the tropics, you want to look at the places with the highest altitude/elevation, as this is what will affect the temperatures mostly. The higher altitude generally implies the lower temperatures. This already rules out coastal cities, and you would be looking at cities/areas high up in the mountains, which tend to be smaller.

Considering that the highest elevation in tropical regions implies colder temperatures, less oxygen, and "more difficult access" (as in, further from sea-trade, taking supplies high up the mountain, needing more infrastructure), I don't think it will be easy to find big cities above 4000m altitude. Most people would choose a bit warmer weather (still cold-ish, around 15ºC). The highest I can think of right now would be La Paz, Bolivia. Some others with less altitude would be Bogotá, Tunja and Sogamoso in Colombia.

And fun fact: since in Colombia there are no seasons, Bogotá is already considered cold and referred to as "the city of eternal winter". Medellín is the one referred to as "the city of eternal spring" with temperatures around 25ºC, and Cali "the city of eternal summer" with temperatures around 30ºC.

He mentions that he uses Hetzner's volumes for storage and storage box for backups. Hetzner's docs don't mention anything about at-rest encryption and Immich does not encrypt data either, so anyone with access to the VPS or Hetzner account would be able to see them.

If you want end-to-end encryption I'd suggest self-hosting something like Ente

Why did you choose a volume to store photos instead of the storage box? I have a similar set up but I mount the storage box with CIFS and use it as the main media storage. I have not noticed any latency issues so far.

I followed Hetzner's docs on how to mount it with a small twist.

The docs say to edit /etc/fstab to add some automount config using charset=utf8 but the VPS OS did not include the utf8 charset module by default (Ubuntu used to to bundle it but now it doesn't). So had to run:

# Install additional packages
sudo apt install linux-modules-extra-$(uname -r)

# Make OS load nls_utf8 module on boot
sudo echo "nls_utf8" >> /etc/modules-load.d/cifs.conf

There was a way to load the module without reboot but can't remember. Once I did that, I followed Hetzner's docs and that was it.

and I just found out that running sudo apt full-upgrade may update your kernel which means you have to do the module setup again for the new kernel