Certainly a Peperomia. Need to see the inflorescence to ID a species.

That my friend is a beautiful Peperomia Magonoliifolia plant, and/or it could also be a Peperomia obitusifolia! It is a bushy perennial with a height of approx. 25 cm, with fleshy, smooth leaves up to 10 cm. They are thick, shiny, fleshy petioles grow up, and are a major advantage of the gift of the plant. There are cultivars with different colors of leaves, for example leaves are green with creamy margins etc. http://commons.wikimedia.org/wiki/File:Peperomia_magnoliifolia_2011-01-17_Berlin.jpg In Poland, it is grown as an ornamental indoor plant. Peperomia (radiator plant) is one of the 2 large genera of the Piperaceae family, with more than 1000 recorded species. Peperomias are grown for their ornamental foliage and sometimes for their attractive flowers (Peperomia fraseri). Except for the succulent species such as yours, yet they are so pretty to watch grow! They vary considerably in appearance. Some have threadlike, trailing stems and some have fleshy, stout stems. The leaves are smooth and fleshy and may be oval with the leafstalk at or near the center of the leaf blade, or they may be heart-shaped or lance-shaped; their size may vary from 1Ð4 inches Info was from Wikipedia: https://en.wikipedia.org/wiki/Peperomia Harvest, Propagate, and Enjoy! – John the green Thumb ÒA garden is a complex of aesthetic and plastic intentions; and the plant is, to a landscape artist, not only a plant – rare, unusual, ordinary or doomed to disappearance – but it is also a color, a shape, a volume or an arabesque in itself.Ó Roberto Burle Marx, Artist, Architect and The Father Modern Landscape Art!