D-Link AC1200 Wi-Fi Range Extender (DAP-1620)
There's definitely a lot to like about this wireless extender, so you should consider it before looking at other available options. It supports older wireless standards such as wireless-N and wireless-G, but it also works with the latest wireless AC1200 modems and routers. This is great if you have wireless-AC hardware already, since you won't lose signal quality or have compatibility issues with this extender.
This is also a dual-band model which helps your wireless signal reach further and remain accessible in dead zones. This is a great option if space is an issue since this extender plugs directly into an outlet and can just remain mounted on your wall. It has two small antennas which fold down when not in use, along with LED indicators for quickly checking power and signal strength. You only get one Ethernet port on this model, so keep that in mind if you need wired connectivity, but the small size and easy set up more than make up for this.