It really depends what you want.

For the floor or wall with no transparent surface, it would be a mirror

For glass you want to add a fresnel_blend node. With this one you can vary the reflection depending on the angle.

There are a couple of other variations. If you use fresnel instead of transparency you would a glass effect. But be sure that your diffise color does not drown your reflection. Ideally reflection value + diffuse value should not exceed 1.0

Bagginsbill has some nice simple glass shaders - search for him and glass as keyword

But maybe you don't want realism at all, you just want to have the effect. In that case play with the specular node and transparrency falloff.

In other words, experiment and see what effect you want