My thoughts on this (from someone who grew up in the Barra/Recreio area):

I love it how people just highjack a brand, making it look like it's some sort of official World Cup brand. By the looks of it, this is just some people who set up a makeshift camping ground in the backyard of a large house. As this seems to have been converted specifically for World Cup tourists, it's anyone's guess whether they will have built sufficient facilities (think toilets, showers, etc).

GBP35pppn for camping is extortionate anywhere in the world. Make no mistake: with the extortionate prices people are charging in Brazil ahead of the World Cup, I expect a lot of vacant rooms when the time comes, which will be flogged in the market. If you're travelling with someone, BRL300 will get you a decent room in town, once prices come back to "reasonable" levels. I have seen recently an Ibis in Sao Paulo going for BRL220pn… A bed in a hostel in Zona Sul might end up costing more like GBP25pppn when prices get back to "normal".

Location: while it is true that it’s in the vicinity of some lovely beaches, bear in mind the house itself is in the middle of nowhere. It’s a 500m walk to Avenida das Americas, which is a busy road, but there’s nothing at that point either. So with no shops around, and no bars, etc you’ll have to rely on the camping site for a good portion of your food and drink. While they seem to offer a shuttle, it’s anyone’s guess whether they will run it continuously. There are now “fast” buses running from Avenida das Americas but it may take you 1h to reach the “beginning” of Barra, where there might be some action in terms of bars, and FIFA Fan Zones, and another hour to reach Copa. That’s in normal traffic… And when you get off the bus at night, expect to walk a dark road back to the campsite.

My advice: book a few days there (maybe 3-4) and be on the lookout for alternatives. I doubt they will be booked out anyway so if you find you love the place most likely they’ll have a spot for you to stay on, and there would be nothing worse than paying for 30 nights in advance and then finding you’re stuck in a place…