Firstly their own website is a bit hard to find, so here it is:
http://www.hotelrima.com/english.htm
Just got back from a week at the Rima (stayed 15/9 - 23/9/08. I found it a basic but lovely hotel. The best thing about it is the location - most rooms face the beach, with wonderful views over Marmaris bay, with mountain going down into the sea. Nice balconies to watch it from too. Just a quick walk (yes, it's about 2 minutes) through a empty grassy lot to the beach (I imagine that at some point this might be built on).
Some people have complained about the cleanliness of the hotel, but I couldn't fault it. Our hotel was cleaned every day.
We had a mini-bar fridge in our room (though there were signs up saying not to bring food or drink up to the rooms - bit of a mixed message!) We didn't flaunt any food or drinks we brought in, but nobody seemed to object to us keeping food and drinks in our fridge. I wouldn't keep food outside the fridge though - I once accidentally spilt some pretzel crumbs on the floor and woke up to find ants arrived from nowhere. Good to note they didn't come back after I removed evidence of the food! :)
Unfortunately there's only 1 powerpoint between the TV and fridge, so you have to choose whichever one you want.I took a travel kettle as well and got some milk from the nearby Mega Market (which also does amazing baklava!).
We went for the bed and breakfast option. Breakfast was Turkish - tomato, cucumber, feta cheese and another cheese a bit like mozzarella, boiled eggs and olives. That was fine with us, but others might not like it. You can pay if you want a full English. If you go for half-board, dinner is a set Turkish meal (we had this one night, it was very nice) - again you have to pay if you want something different, so I would suggest B&B may be the better option. We spent one day by the pool instead of the beach and ordered cheeseburgers, which were great. The staff were all lovely, very friendly. We found the bar quite expensive, and we're not really bar people, so we didn't spend much time there, but it had a pleasant relaxed energy.
We paid for airconditioning, which worked perfectly - £20 (40 Turkish lira), and it was worth it.
If want to just relax and you're looking for a simple room near the beach, and Turkish food, this is the place. If you want an amazing pool, hyperactive reps and want to forget you're not in England, this is not your place.