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I have something similar. It's ok.
It's noisy, you'll need noise cancelling headphones and if you want calls a mic that doesn't pick up any background noise. It's also noisy enough to be noticeable downstairs/outside.
Rooms warm back up again fairly quickly if you don't keep it on.
If you don't have a sash window then getting something neat for the exhaust is a bit of a hassle.
It costs a lot to run. Probably a pound an hour or something now.
Edit: that reply was meant to be @Velocio
One of my old jobs was in an exceptionally old building where the aircon routinely failed so we had a couple of those.
They work well. Ime the issues are: