I will warn you that most people who buy a camper van (or recreational vehicle / RV... We call ours "the RV") definitely anticipate using it more than most people do especially if you take into consideration a 5 or 10-year period (in our case it's literally been 25 years which is probably unusual to not only have it for that amount of time and maintain it and insure it and drive it but to drive it and use it a lot!)
I can't speak to the quality of the newer ones or give any advice as to brand or anything like that but I have heard that newer ones are exceptionally expensive and not always the best quality, but then again you can run into a 'lemon' no matter what you're buying.
And it also depends on the size, some of them are ridiculously large and difficult to park and difficult to drive and maneuver, and other ones like ours, fits into a regular sized parking space (but sleeps four).
Some of them come with all different types of amenities. Ours originally came with a hot water heater but we took that out for the extra closet space. Ours came with a shower as well, integrated into the bathroom, but we didn't need that. So we took it out. Ours originally came with a microwave but you have to be attached to electrical for that, which more times than not we were not. So we took that out too. Ours has a four burner gas / propane stove top which is extremely handy. It also came with an oven which to be honest, we didn't use. I mean, we're not exactly cooking a turkey or baking a cake are we? We use the oven for storage.
We felt that in these modern days we needed more usb/electrical plugins, so they were added. But we also added an extra battery (under the bench seats) as well as solar panels to the roof. Modern LED lighting takes exceptionally a small amount of power and makes very little heat so it does a fantastic job as opposed to regular incandescent bulbs (that this came with originally).
Our model did not come with an air conditioner, although others do. Yes it can get bloody hot and humid in the summertime, we've camped in temperatures that had a real feel of more than 40° Celsius. I have to admit, I do not love that. Even with all the windows open, with screens so you don't get the bugs, too hot is extremely unpleasant.
I've never had a problem with winter camping even though we've been out in temperatures lower than -20, we do have a heater and we find it to be most sufficient, but even a small electrical plug in one should be fine (it's easier to stay warm than it is to stay cool, you can always put on more clothes but you can't take off more)
We are fortunate that some of our bicycles can be carefully brought inside the side door, the rest can be mounted on a bike rack over the spare tire at the rear.
We have found that we have saved so much money in the accessibility of being able to stop and stay where we like (dedicated camper parks are wonderful, but even parking lots will do although there is a learning curve to this...) and bring our own food (our model has a small fridge with a tiny freezer). Yes, you will pay more for petrol compared to any other vehicle you've ever driven before, but, taking in mind that you're not paying for hotels or restaurants or snacks, there's spending money and they're saving money....
Hope this helps!