Wifi to Detached Garage Apartment

[BullBay]

We have a detached garage that's about 300' from our house. It has an apartment above the garage that we are planning on using as an AirBNB.

I want to get wireless signal to the apartment with guest access and the AmpliFi HD has been suggested by one of our friends but I'm wanting to make sure it's not overkill.

I don't care a whole lot about speed as long as it's good enough to stream.

Any suggestions?

 

[sfx2000]

Please try not to cross post - you'll get a better answer...