  Answering a question of Hegyv\'ari and Ruzsa , we show that if A is a set of
integers having positive upper Banach density, then the set A+A-A:= {a+b-c: a,
b, c are in A} contains Bohr neighborhoods of many elements of A, where the
radius and dimension of the Bohr neighborhood depend only the upper Banach
density of A.
