I would like to keep using a cheap, larger format tile (so that we minimize grout lines) with dark colored grout, but need some fresh ideas to modernize it a bit. 

I realize that this may need some light fixing up here and there since it's not freshly rehabbed.

I am in a position pretty similar to you, (freshly) 25, finished up college a little over a year ago, and looking at getting into this in the next 6 months and move to the Winchester, VA area.

I liked the tenant he found and decided to just do a fresh lease with him.

New windows definitely have more of an appeal to the tenant because they offer a fresh look and will reduce your energy expenses. 

I am fresh in the wholesale real estate game and would love pointers, advise, maybe even possibly meet up with local wholesale investors to chat and maybe eventually co-sale.

Freshly Painted?

It created a fresh awareness of hurricane protection.

Then remediation of all mold spores, (which must be sanctioned by a state licensed biologist) using dehumidifiers and antifungal agents to treat the area.

I was fresh out of college and just knew after paying rent for 3-4 years, I just had to buy.