I noticed this new advert (posted 12 March by the same company that posts the adverts for 429 Hagley Road West):
External Link/Members OnlyThere is also a website
External Link/Members OnlyBoth contain the address and phone number.
From what I can see on Street View the address seems to one of a small row of shops in a fairly new estate - the pictures on Street View were taken in February at a time when, it appears, the shop was in the process of being fitted out.
I rang the other day to get more info without much success as the lady I spoke had an accent which might best be described as impenetrable and, I think, she did no more than repeat what is contained in the Vivastreet ad.