Does it need venting or a gas line?

No. It is an electric fireplace, so it plugs in and needs no vent, chimney or gas line. That makes it usable in apartments and rooms without a flue.

Can I see the flames from the side?

Yes. The glass wraps three sides, so the flame effect is visible from the front and from either side. That is its main difference from a flat single-front wall fireplace.

What does the remote control?

The remote lets you adjust the fireplace without reaching the unit. The listing does not detail every function, so check the controls on the unit itself for the full set.

How does the timer work?

The built-in timer shuts the fireplace off after a set period, so you can leave it running while you fall asleep or leave the room. Set the time on the controls or the remote.

Is it hard to mount on the wall?

It mounts to the wall like a large picture or shelf, so you need tools and a wall that can take the weight. A stud or proper anchors are needed; a hollow drywall span alone may not hold it.

How does it compare with a flat-front wall fireplace?

It shows flames on three sides instead of one, which gives a fuller fire view. The trade-off is that it projects from the wall more than a slim flat-front panel and is smaller than many single-front models.