@Sundar: Most Vastu Saints say the mandir in the house should be in NE. Since we live in flats these days so locating a NE corner may at times become a tedious job. Make sure you do not have the Mandir in SE or South corner else you will observe that you can hardly meditate; in a few cases inmates of the house hardly have time to say hello to God :) You can place it anywhere except South, SE and of course never in the master bedroom. If you can worship while facing North, East or North East- it will be great. Incase, such a direction is not possible and you have to face WEST while worshipping - the simple remedy is to hang a small mirror on the west wall so that what you would see through it would be the east direction while praying. Cheers.