I am staying at this hotel, the Hotel Plaza Monumental, right now. I've been here since Wednesday, December 8th and I'm leaving on the 14th. I found out about it from this very same thread while staying at the Aloha Sol, and I decided to go check it out.
I paid $800 DR pesos per night. They gave me a room right next to the front desk, so I have internet in the room due to being close to the modem, but with most rooms the signal won't reach, so you'd have to sit in the cafeteria to use internet.
The rooms are plain and the one I'm in has no windows. It has two beds (one is a waterbed), a TV and a Fridge. If you're looking for a clean safe and CHEAP place to stay, this is the one. It's not luxurious or extravagant, just plain and simple. The staff is very friendly and helpful. I would definately stay here again, preferably in the same room, for the internet convenience.