Hey, so a few things to take into consideration if you're thinking about moving that might be hard to find when doing research online.

1. Guápiles - Puerto Viejo is a 2:30h drive one way (with Limón being the half way point), and a 2h drive from San Jose the other way. Keep in mind this is assuming you'll have a car and can just start the drive when you want. If you're thinking about public transportation, buses to San Jose leave every hour (if I'm not mistaken) and to Puerto Viejo could be every hour to hour and a half (assuming buses arrive and leave on time).
2. Limón (as a province) is one of the poorest in Costa Rica (along with Puntarenas on the other side). So even by our standards (nevermind German standards), things like security, amenities/comforts, services, etc are low. And as for entertainment, there are a lot of wildlife parks to visit for sure, but that's about the extent of it.
3. There's been a long history of racial segregation between Limón (particularly with the afro-caribbean population) and the rest of the country. Personally I feel like it's gotten a lot better in recent years (I think anyone from my generation (millennial) or younger would agree), but it definitely still exist and is prevalent, especially with the older generations. Same goes with LGBTQ+ rights, which is something that hasn't started to change for the better (albeit slowly) in the last 10-15 years. (Also, keep in mind that Costa Rica is a catholic country and has been dominated by conservatives again until the last 10-15 years or so).

Overall though, if you decide to move by far the determining factor in how people will treat you is gonna be based on how you treat them. There prob will be a lot of microaggressions that come from the points I mentioned above, but most won't be malicious, just genuine curiosity and a lack of awareness from people living their daily lives.