A frequent business type near American Pizza is Charities and Charitable Organisations.
Visit one of the few local Book Stores. Need a room for the night in Islington, London? There is a local hotel. For help with marketing and branding, consult with an Advertising Agency available locally. There is a new and used car dealer locally, offering deals on brand new or used automobiles.
The local Employment Agencies can assist with anything from graduate to executive positions. There are a few attorneys nearby. Only a stone's throw away you will find a management consulting firm. Looking for property in the neighborhood? Why not try the local Real Estate Agent?