The Corvin Promenade is an urban re-generation scheme and is located in what is currently a fairly rough area of District VIII. It will be built from scratch, so it's difficult to envisage what it will look like when finished. The marketing photos of outdoor cafes and restaurants try to create what developers are calling the 'new city center'. This term is getting very tiring as almost every new project over here tries to be the new centre, regardless of their geographical position. While the Corvin Setany won't be particularly central, it is no doubt an ambitious project and could be successful. I think it's a bit of a risk, particularly in terms of location, but who knows. It might work. It might not. It all depends on the commitment and efforts of the development team.
The scheme is huge, which would worry me a bit - something close to 3,000 apartments. The area is not particularly close to universities, apart from part of the medical faculty at Nagyvarad Ter, but I can't see expat students being particularly interested in renting here. Corporate tenants may be interested as it's close to various businesses.
Best of luck,
Budapest