We've booked a double room and when we arrived we saw this:
http://www.youtube.com/watch?v=85NWyvxw2kw
- the windows were not quite closing (and it was 10°C at nights in Jan)
- the bathroom door looked like it has survived a war
- the tap was hardly coupled with the basin
- the shower had an erectile disfunction and the hose was torn into pieaces and the water was hardly flowing [and it was damn cold too!]

Given the number of defects I'm pretty sure the room has not had any repair in a few years.

We've gone to the reception and it turned out they had only two rooms for replacement:
1) Larger double-bed room with 5 half-broken windows (= bad for January)
2) One single-bed room
The latter had only one major defect - the bathroom door was not quite closing with a 4" gap.

They've kindly agreed to move us to the single-bed room, without any compensation of course...
Also, in the middle of our stay one of the bed lights has fall off the wall, but they've fixed it quickly.

That said, the first room was so terrible I'd never invite a guest there.
I'd get cold for sure if we stayed there..
This is why I set a very low rating - I felt like they've tried to fool me instead of providing the best service they could.

Other than that, the hotel was OK.
It was clean, the staff was friendly (but the receptionists hardly knew English!), the breakfasts were cheap but OK, the beach is just 1 min of walking.

We stayed there twice, beginning and end of trip. It offers, what you pay for: nothing spectacular but perfectly okay. The room was clean, the beds good, the room fairly quiet (that is: AC-noise does not bother us). For a little extra (10 CUC) we got one of the bigger rooms (109). We reserved this room twice. The investment was well worth it. Breakfast was a bit below standard Cuban breakfasts but also okay. Staff was friendly. We had to pay 2 CUC extra to store our luggage for a few hours. We liked the location because you are able to walk to restaurants, shops, bank and artisan markets.

We stayed at Dos Mares twice during our visit to cuba. Our first 2 nights were great. Nice big room (209) with an obstructed view of the ocean but ok. The room was very clean and quiet with 5 windows for a cross breeze. The breakfast is standard cuban fare but sufficent to tie you over for a bit. We like the room so much and the price was perfect 40 cuc for both of us we decided to reserve it for our last two night in cuba since we like it we thought why now. Well when we arrived back at the hotel 10 nights later the room we reserved was not available since the people who were staying there had a 16 hour flight delay and needed to stay another night. (I thought that once a room was reserved they should have moved those people out for there last night since the room was already reserved.) She told us that we can have room 109 which is right below and is the same so i thought ok no big deal. We got the keys and went to the room to have a look. First of the light cords above the bed had no plugs just the wired stuck into the wall mere inches from your head, the toilet had no seat and the towels in the room didn't look all that clean. I headed back down to the front desk to voice my concerns and the woman said that she can give us 101 for the first night and then 209 for the second. The room was smaller but she still wanted us to pay the 40cuc after a long drawn out debate she reinburised us 10 cuc. Thanks for the effort but next time i think they should stick to there reservations. Over all good location just mere steps away from a quiet section of beach and close to everything varadero has to offer.

The hotel is what you pay for. We had quite a big, clean room (we had to pay little extra). Theres TV, bar downstairs and breakfast included (Cuban standart). Beautiful beach behind the hotel. There was a a small lizzard in our room to be honest. They wanted us to pay for luggage stoage the day we were leaving which I found a bit unusual.