With the amount of property avaiable for rental in the area you could easily rent a seperate apartment, one of the older one´s closer to the town centre, for around €300 - €400 per month including bills, if that would suit
In the guide that I have sent you there are links to a number of local newspapers that have rental property specifically The Costa Calida Informer, Round Town News and The Reporter for your area
Just make sure that the community rules allow that it can be used for business purposesand remeber additional insurance may be required