[QUOTE=Sebastiane;2694223]If I go to Wellcum where is the best place to get a hotel: Villach or Arnoldstein? Also, how easy is it to get a taxi from these places to Wellcum and how much does it cost?[/QUOTE]Wellcum has its own hotel rooms within the club. You can book online via the club website.
It's a great way to enjoy the club for a few days. Rooms are like iBis hotel. Minimalist, clean, no aircon which is a problem in warmer months (open a window and you get visitations from a wide variety of insects from the neighbouring forest). All you need as you spend most of your time sleeping before going back into the club. Breakfast is optional extra when booking. Small TV with no English channels, but you get free WiFi.
From Villach, look for red Express taxis (usually easily found outside the railway station) that have the club logo on them. They have a deal of EUR 30 between the club and Villach (or that's what it was back in 2019 when I visited last time).
If you want to stay away from the club, I'd recommend the voco Villach hotel. There is a small hotel in Arnoldstein, but it's a good 30min walk to Wellcum so you'd still want a find a taxi and it's a very small town compared to Villach.