He's not actually moved in just looking around. So the good situation hasn't happened for him yet - so for him it is not 'is' but a future possibility - 'could' - suggestive that he expects it 'will' or 'can' (if done right) be good. d
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Anonymous(If I moved in here), this could be very nice.But this would mean that your friend does not expect or plan to move in with you (hence the second conditonal), so this interpretation is probably not right.