Rumbles onto thread ...
It's all been said above and YY 100% agree - they need space.
I am
that the cage in the link is advertised as suitable for a rabbit ! (I have never kept rabbits but I know enough about rabbits to know that I don't know enough to keep rabbits !)
Even worse is another one on a link that would suit small agile rodents like rats (not sure its big enough but the style of it is ) but no way would guinea-pigs manage those ramps and tiny platforms and meshed surfaces .
Personally I don't like those little plastic hidey houses in the cages , the door is small and you could potentially have one guinea-pig bullying the other and trapping it . Even in a non-confrontational pair , one will trap the other ( out of laziness and they are quite dense animals -though I love guinea-pigs beyond measure) .
Don't rule out boars - we've had 4 boars and 4 sows over the years and boars (IMO) are cuddlier . But they do need loads of space and you need to understand their relationships , boar pairs are not a natural phenonemum but it works if you you get it in order .
My pigs have never fathomed ramps , (DH built a lovely haybox and wide shallow carpeted ramp in the Pighouse but they just his under it 
We've always used the Pighouse (wooden playhouse adapted for them) in conjunction with indoor cages (C&C and a 4x2) for indoors winter , in our small bedroom.
Depending on our piggie groups at any time . We had 5 pigs at one point in two groups .
At the moment we are down to our last piggie , nearly 5yo, She will stay in the bedroom (near to DD , she "helps" with homework ) apart from outdoor grazing . She's just recovering from an eye ulcer so she's still fragile but eating well and very noisy .