It is a very old hotel, government owned hotel! "Vergane glorie" in Dutch.
The staff was not friendly at all. The rooms & all facilities like restaurant, spa facilities are just old & staff is as old as the hotel, I think.
The rooms are very cheap decorated!
Breakfast is a mess! My boyfriend did not fitt under the shower... He was too tall but he is not extravagant tall! 1m85 à 1m90?
hotel Admiral does have a great location on the "promenade"
We changed hotels the 2nd day --> to hotel Ambassor.
That was not a big improvement. This hotel was also from the same chain / owner.
Never again!
My suggestion for Opatija would definately be the Mileneij hotel chain!!!

Very nice otel, excellent location, superb view from the rooms, very nice and helpful staff especially the animators who gave us a guided walk trough the city.
The only negative issue was the lack of free internet.

Service people at the desk had an attitude, in fact they were almost hostile. Room was pretty old, and folded bed was uncomfortable, and we were not told before hand that we will have to use one for the 3rd person. The TV antenna was in bad shape as well and we needed to play around with it all night to get a half decent picture. Still can't believe this is 4 stars, we have been in hotels that cost less than half during the trip that were way way better in every respect. Go at your own risk.

In a town of elegantly decaying Austrian mansions, this hotel is somewhat an anachronism, but it does its job Admirably. Ah hem. The room was clean and spacious and fully air-conditioned (once I worked out that it only stayed on as long as the balcony door was shut). It's location is perfect; a short jaunt into town and right on the promenade which links a number of little towns/villages and is well worth the walk. The hotel mainly catered for Germans, Italians and Eastern Europeans, mainly over 45, so being English and pre-geriatric we did feel somewhat in the minority, but as we are not hardened party animals, this was not an issue.

Both pools were fine, but with miles of stunning coast, we really didn't need them...within 15 mins walk you could find yourself an all-but secluded cove (even in a summer month) to swim and get burnt, should you so wish. The beaches are all pebbles with a peppering of sea urchins, so I would recommend bringing sea-shoes, or buying them there. So, yes, don't go to this part of Croatia at all if you want sandy beaches.

Breakfast was good; as varied as you will find anywhere. We were B&B only so didn’t experience dinner in the restaurant, but we did dine one night in the Taverna (connected to the hotel) and the food was fine and reasonably priced. Restaurants in the town vary greatly. Vongola, along the prom towards the town centre, had a good menu and the Chardonnay from Krk was divine. Eating right on the seafront was lovely too. Fish does feature heavily in all eateries in this area, as does lots of red meat. Vegetarians are somewhat of an anathema to Croatia, so if you are one (or a fussy eater) you'll probably end up resorting to pizza a lot of the time.

You can explore the area from Opatija and there are tour operators which will offer day trips inland, or to Venice (if you can brave the boat ride). We didn't hire a car, but this is probably the best way to explore the area and I would most certainly recommend this. There is a car-hire place in one of the shops attached to the front of the hotel.

The one down-side to the whole experience for us was the staff who can be variable to say the least. Whereas some were incredibly helpful and friendly (like the majority of people working in cafés and restaurants), asking for an extra towel from one man on reception was like asking for his credit card and PIN. There is loads to see and do in the area, so we spent hardly any time in the hotel and, therefore, it suited our needs well. If you want US style "three bags full, sir" service, this place probably isn't your bag.