Debra is correct in this. Most often an end unit, because it has no neighboring unit on one side, will instead have a bank of windows along the end of the building. That alone adds a much more open feel to the unit, with more light and at least some sort of view. Not all end units do however, and some simply look down upon a parking lot or perhaps some other undesirable view, so its important to go see the property in person and decide if the lack of a neighbor on one side, the possible windows and whatever view they offer is worth (to you) any possible increase in price the seller is asking.
The best way to price your home right is to use comparable pending and sold properties in your neighborhood then look at the active to see what your competition will be. Don't get emotional about the price. Only use solds within the last few months since the market is changing very fast~