District 9 close to the Danube is likely to be a good investment in my opinion. The National Theatre is located close by as well as Raday utca, which is one of the best streets over here for restaurants/bars, etc. Some of the popular Summer bars are also within walking distance. I see that part of this particular development is on a busy street though, so be careful which apartment you go for if you do decide to invest here as noise could be an issue. The design looks fairly good compared to other new builds in the city. Have you been given any more specifics such as price, etc?