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I'm not great with heights ,but the first few min are the only time I flt a bit queasy. After that it was fine. Make sure you get up earlyish if heading for sun set. We went up around 5.30-6pm for the 6.30-7ish sun set and managed to get a good space. Also make sure you go to the top floor...the windows here slant inwards at the bottom allowing a better shot down, the other floors are the opposite.
Also make sure you have a good cpl..I had a cheap 20 pound one and it only helped a little.