The choice of screening will depend on available budget. Walls are expensive to build, wooden screens with posts and trellis panels are much cheaper. Planting a hedge is usually the cheapest option, but may take a while to grow in unless you can afford large plants or an instant hedge.
Cheaper Indian Sandstone is not always the bargain it appears as it is thinner, or poorer quality and more porous causing leaching of the minerals in the mortar onto the top surface of the stone. There are some inexpensive granite slabs currently available that make a wonderful surface only slightly more expensive than Indian Sandstone. The more expensive options are Travertine, York stone, Basalt, and Marble.
All the above mentioned are excellent patio materials to be use for your patio. In addition, you can even use a combination of different types of patio materials to make your patio comfortable. Also, you have to consider the drainage properties of each material. For instance, individual stones, bricks, or pavers will let water through more than a whole slab of concrete.
Location of the patio : Most patios are sited immediately adjacent to the rear exit from the house because it is convenient - this may not be the best location for your patio. The back of the house may be shaded all day and therefore not ideal if you wish to like to sit in the sun. Consider a small terrace to the rear of the house with another seating area somewhere else in the garden which gets more sun. When designing a garden it's a good idea to include more than one patio.. One patio can be sited so that it catches the last of the evening sun to provide a warm spot for an evening drink or meal. This makes the garden much more interesting and ensures that you are using more of the garden.