The thing abut the UTC towers is, its very much like a dorm. You get a room, a bed, a desk, and your own bathroom but there are no single rooms and because a lot of college students live there, there are a lot of room parties on the weekends. I've been to several lol. So, I wouldn't recommend UTC, but right next door there are apt complexes like Mosaics at Metro and Post Park and a few others which offer a range of prices and floor plans. They're all walking distance to Prince George's metro station which is only a few stops away from the HU station.
The Howard Plaza Towers is I think the graduate housing you're referring to. Thats where I live now, in one of the dorm rooms in the building, but I am moving at the end of the school year. Their commercial apartments (which is what they offer to the grad students I think) are ok, from what I've heard. The rooms can fit a queen sized bed, the bathrooms are small and you'll be sharing unless you get a single. The kitchens are ok; garbage disposal, stove (4x4), fridge, limited counter space. The room may come with a desk too i'm not sure. There is a rodent problem in the building, i.e., mice and roaches. Some residents have "never seen one" while others have had to change rooms because the problem was so bad. I currently have a roach problem in my suite and its not the biggest problem I have with my room but it is one of the reasons I decided not to live there anymore. Mainly however, I've lived there long enough and I just want a change so if you can deal with the occasional mouse or roach, I would recommend the towers. Its a 5 min walk to the med bldg, 5 mins to the U st. Metro station, 10 min walk to Columbia Heights (Giant, Marshalls, DSW, Chipotle etc...).
Good luck with the housing search everyone!