Kleinanzeigen.de and Hood.de for Germany and Vinted.net for several European countries. I use Vinted and Kleinanzeigen quite a lot and had plenty of positive experiences.
my wife is currently in germany (north) as her dad died and she had to get rid of a ton of stuff. she said kleinanzeigen is barely active and she couldnt get rid of a bunch of things (anything from a big tv to collectables). she thinks the culture of buying used just isnt in vogue.. here in ireland, adverts.ie is absolutely thriving
Kleinanzeigen is very active and I suspect that this might be the problem here. It's absolutely flooded with furniture and antiques so it can be a tough time for sellers due to the competition. It's great for anyone looking to buy though.
Half a year ago I posted a 15 year old Flat Screen TV, a 2.1 sound system, a smoke detector set and a couch table from Ikea for free. I had more than 100 messages in two hours and everything was picked up on the same day. I guess it really depends on what you want to get rid of and at what price. If you give away good stuff for cheap or free, there'll be a ton of attention. Old fashioned furniture however might be rather hard to get rid of.
In Germany, FB Marketplace or Craigslist were never a thing.
eBay was and is still big
Kleinanzeigen used to be part of eBay but is now it's own thing and is used widely.
Vinted (used to be Kleiderkreisel) was a place to swap clothing with others, it's now a second hand clothing marketplace. It recently expanded to electronics and includes Italy and France now.
Ricardo.ch is an absolute hellhole in Switzerland, they charge ridiculous fees and don’t offer any sort of protection so they basically make massive profit margins for nothing.
In this case it’s probably more ethical to use literal facebook marketplace.
There is an alternative that doesn’t charge fees, Annibis, but it was bought up by Ricardo and turned to shit. They really are the devil.
In Romania, olx has a huge spam problem. There are scammers trying to scam sellers, since the platform encourages people to make phone numbers public.
As a buyer, I don't like it either. Everything is overpriced. For example, I was looking for some ikea furniture and the only sellers in my area were asking like 80% of the price of a new one. Tech is overpriced too... Like $150-200 for an ancient i3 or i5 laptop with 4gb of ram... I can get a better deal on ebay (where shipping is at least $20-30).
@Sunshine Nice!
A small clarification for Sweden though: Tradera is more like eBay as it is focused on bidding. Most people I know of use blocket (https://www.blocket.se/) for just selling stuff.