We stayed at the Dionysos 25 July to 8 Aug and it was hot. There was a heat wave and the first day it was 45 degrees C with no breeze! The temperatures cooled down to 32 and most days there was a breeze so it was bearable, although often too uncomfortable to walk around so we didn't do much sightseeing. We went at that time of year due to school holidays but would like to go when it's cooler.
The hotel was first class, very clean, in safe secure surroundings. The Management are excellent and their staff were well trained. The service excellent, particularly the Maistros Pool Restaurant where you will be served by Tsabika (a lovely gracious lady), Dimos (a charming and witty man) assisted by Anna, Kostos and Evi. We went there most days for our afternoon beer - the food is good there also, but with all you can eat for breakfast, we weren't hungry. The bedrooms were comfortable with large beds (5'4"). Our view from the balcony was over the back gardens and not great, but as it was too hot to use the balcony, didn't bother us. The pool although salt-water (you do get used to it, even if at first you don't think you will) is very large and lagoon-shaped with lots of room. It's the best pool we have experienced. We didn't have a problem finding sun-beds, (and be warned they do police the pool area removing towels if you put them out in the morning before breakfast), but parasols (which are large and cover several beds) are scarce, you do need to find shade in the middle of the day at that time of year - so if we didn't have a parasol went for a beer at the Maistros! The loop-music is also better there than the pool DJ who arrives about 1pm with his laptop and has a very limited choice of songs, it was awful and probably the only downside to this hotel - but then it was a good excuse to enjoy the company of The Maistros Staff and have a beer!.
In the evening we favoured a Taverna called the 'Olympias' (go out of the hotel and turn left, at the bottom of the road turn right and walk towards Rhodes Old Town for maybe 300yds - past the Cosmopolitan Hotel). The owner Vajos Boulassikis knows his trade and the food is excellent, his son Giorgis gives very good service.
Rhodes Old Town can be reached by taxi (we were told by our Rep that the buses are full by the time they get to Ixia and at 2 Euros each, the taxi at 6 Euros - there were 3 of us - was a better choice). If the Hotel books the taxi for you apparently they charge 1 Euro for the privilege, we don't know as we walked to the taxi rank, again at the bottom of the road turn right and the rank is on the shore side of the road. Despite reviews advising not to use the rooftop restaurants, as they charge a premium and the view isn't worth it - they were right - we did so, only to wait over an hour for our meal and on enquiring found they had not even started to cook it (they were busy, they said!) we left without eating. There are many restaurants in the narrow alleys where the walls open onto a lovely garden.
We visited Falariki Water Park and had a great day. There are lockers (1 Euro for one use only, in other words if you go back to your locker you need more money to lock it again). The great thing was that the queues weren't very long at all, mostly you could go straight on, sometimes the queue was perhaps 6 people long - which at that time of year we found amazing. When the weather is hot the floor gets hot too and we found we needed flip-flops or such to walk about - although you have to take them off on the rides.
All in all we would definitely recommend the Dionysos Hotel.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.