The UE Megaboom has an amazing battery life and a volume loud enough for small parties, BBQs and beach trips. I even use it in the car if I'm going to be parked for a while.
Great price for a 5 button mouse. I've had good support from VicTsing in the past.
Mesh wifi systems are great for large homes.
What's important here, is that the range extender supports "802.11 AC" which is the most modern (as of March 2018) wireless network type. This will give you the best range and stability
Far cheaper than a Logitech equivalent, with no noticeable drop in quality/performance.
Gets the job done.
Tenants (especially younger ones, such as students) will not tolerate weak internet connections. If you're renting out something larger than condo/apartment, you'll need a range extender to cover the basement well.