I mean what I can offer in return is an open mind, eager to learn, hard work, passion for real estate and investing, and any help to the mentor/investor with his/her business in some fashion like free labor in order to learn from that person.

Clean, fresh, curb appeal(flowers), things that look modern that aren't necessarily expensive, like a nice faucet in the kitchen.

However ARVs for fully updated buildings can be surprisingly high, as well as what a nice modern appt will rent for.Reach out if you want to discuss further. :)

I am curious if a modern renovation would be worthwhile but I don’t know how to pick out the proper tiling/flooring, etc.

It can be interior decoration of the apartment, modern furnishing of the apartment, amenities provided in the apartment, or swimming pool in the facilities area.This should be just one image for the cover photo.

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White interiors/exteriors are in high demand and perceived as more upscale and modern. 

IMO this is the modern and more efficient method compared to bandit signs, driving around, etc.

You should also be able to communicate well with each other and you're operating agreement should lay our roles, responsibilities and compensation in a very detailed fashion.  

You should also look for markets with growing populations. growing jobs and modern/diverse economies.