Don't listen to everything Flyer8 says. There is a bus stop to town almost right outside the avon way building (number 64 bus). Tesco is about a 5 min walk (unless you're crawling). Uni campus is approx 20 mins walk.
I live in Forest Road house now, and I agree it is mostly postgrads here. But it is very quiet, which is good if you want to study. There are 5 rooms per flat sharing a kitchen, separate shower and toilet, except 1 room which has an ensuite and is a little more expensive. The rooms are a decent size, about the same as the Towers. However, there is no common room or anything like that. It is a 5 min walk to Tesco, and it takes me 20 mins to walk to campus. Town is a half an hour walk, or there is a bus stop right outside. However, there are undergrads here, there are some parties, it is what you make of it really, if you're sociable then there are people to be sociable with!
I personally quite liked it- good that it was so close to Tesco (which is a 24 hour one, so can pop over anytime!), quiet, and it's nice to get off campus every day too. Also the fact that I could save £30 a week compared to living in South courts or the houses, means that I saved £1500 a year, thats enough for me!