For a four star hotel I would expect to have a properly working fridge (mine didn't seem to cool) and a comfortable matrass (mine was very hard indeed).
That said: I'm sure if I would have complained about the fridge the staff would have given me another one. Same probably would also account for the matrass (If they have softer ones).
So although the hotel is very far from the center (it takes a taxi about 25 min to get to the center). But then again; a taxi to the center will only set you down about 10,000 sum (less than four USD).
You have to get used to getting a taxi in Tashkent though, since everyone could be a taxi there. Official taxi's are much more expensive, while you could just (try to) stop any car and ask the driver to take you to wherever you want to go. Mind you, you have to bargain about the price in advance though.
Tashkent is known for it's friendly people and the staff at Hayot are no exception. Indeed they are not only friendly but very helpful too. The best example is when I lost my phone!
The staff continued to call my phone every 30 minutes until somebody picked up. Then they arranged that my phone to be picked up by their driver an brought to the hotel. Now this is what I call: top notch service!
Besides the excellent service (really all staff are helpful indeed, with no exception) the hotel is great too. The rooms are very spacious (I had the standard room which was very large already) and comfortable.
Important to know is that Uzbekistan is mostly a Muslim country and you are not allowed to stay in one room with someone from the opposite sex unless you can proof you are married together.
My fiancée and I tried to share a room but the staff didn't allow this proclaiming it isn't allowed by law.
Well besides this, the Hayot is worth it four stars, however..........