This matter of Barret's place being the flower fields has been touched on before in ACF. Or at least in the old Faith thread, where we joked that this gave rise to a new LTD, one between Barret, Aerith and Cloud.
Yuffie telling Cloud to go to Barret's place/Barret no tokoro is only that she's telling Cloud to go to Barret. It doesn't necessarily mean that the big guy's got a permanent residence in the flower fields; only that he's there. I suppose that if Barret happened to be somewhere else like, say, at Elmina's house when Cloud got the call, then Barret's place would have been Elmina's house.
This is the same thing with the earlier translation of CoT by xcomp, where Cloud tells Tifa that Denzel had been brought to "my place"/ore no tokoro. I remember the discussion in ACF about how Cloud's line could have been translated as "Denzel was brought to me". If I'm not mistaken, the official English translation of CoT does translate Cloud's line as "Denzel was brought to me".