If you ask them to write an offer, don't disappear for weeks at a time after you make the offer. 

In addition, while the umbrella did not end up having to pay out, having it meant I did not stress about it at all.  

Every property i use it i make additional tweaks.  

Whatever market you are looking, I'd consider putting out a cash offer. 

Additional resources and tools via brokerage.... 

After that's under control, focus on increasing income through additional work at your current job, taking on a side hustle, or finding ways to increase income on your existing rental.At the same time, educate yourself.

And if still in Spain, how long until it's in US and is shipping additional or is price landed? 

Maybe offer a 2 yr renewal with $1500 yr 1 and $1600 yr 2 or just a one year renewal with $1600 in rent

What kind of savings do you guys have in addition to the income savings each month? 

In most single family zoned areas adding a single ADU is not a value add meaning it will not add more value than the hands off cost of the addition.