We stayed in this hotel for a night, to break up a long drive. And the hotel is perfect for that purpose. It's probably not suitable for a holiday or a long weekend, but if you just need a place to sleep it's excellent and very good value.
The décor is a bit '80s but the hotel is very clean throughout and the staff were very nice and helpful. The breakfast buffet was decent - various cereals, spreads, hot and cold drinks, eggs, etc.
This would also be a good place to stay if you are going to attend an event at the Zagreb Arena - it's right next door.

A group of us stayed at the i-Hotel for two nights in January 2010. It was convenient for us as we were travelling between Vienna and Sarajevo - the i-Hotel in Zagreb was a good half-way point near the main road (the hotel is some distance from the centre of Zagreb) and it had plenty of free parking. The hotel was clean and breakfast was fine. On the down-side, the internet connection was dial-up only. We didn't try the food at the hotel, but the pizza place round the back of the hotel was good and convenient.

Recommended if being close to town and wireless internet aren't important.

I`ve spent some time in Zagreb. It was great. We had a super room... We had a very good weather. The food was excellent and very cheap.It`s a beautiful city !