We have a Devon Firefly which is based on a Ford van. There is a basic cassette toilet at the back of the van but no shower. It is just under 5 metres and is easy to park. The single beds are very narrow and use the front seats swivelled round to form part of the bed. We usually sleep remarkably well!
We use campsites - bigger ones often have local food vans bringing pizza or fish and chips and some have a decent shop on site, with fresh bread in the mornings.
We travelled across Europe through Germany, Czechia, Hungary, Slovakia and Poland in 2017 and loved it (we had a slightly larger van then). In 2018 we went to Denmark and Sweden, visiting friends there, and again, loved it.
We are happy to rough it a bit and we were lucky with the weather on our trips. In 2017 we mainly stayed in the major cities and found campsites near to public transport to take us in.
More recently we’ve stuck to the UK and Ireland.
You usually pay a premium for a VW so if cost is a factor, look at other brands.