I was a frequent diner at the old Misono restaurant on Lenana Road and now it has moved to the Greenhouse Mall on Ngong Road. The mall itself is unappealing and there was risk the restaurant may have gone down-market, but I ate there recently and found that standards have been maintained and perhaps exceeded. The decor is great and carefully thought out, the staff were very welcoming and friendly, and above all the mixed sushi/sashimi set that I chose was excellent. It was busy (even mid-week) so seems to have stayed deservedly popular.
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