Hello "Gajos"...
Some apps that you should install during your stay in Lisbon ( Lisboa )
Mygon - Used to find safe Restaurants near your. The app will show to you Restaurants with amazing discounts, like Lunch for 7€ instead 12€ of regular price without app, it also will provide rates and comments from others users, do not forget, run away from Rua Augusta restaurants, you can buy some cake and etc, but it is not a good palce for meals.
Google Maps and Photos - Will be usefull for sure, an advise for Google Maps, use OFFLINE MAPS to save Internet, use hotel internet to download OffLine Maps and Google Photos will help you save space in your phone.
Wi-Fi Map - Will help you find Wi-fi passwords near you, remember, use it carrefully. Advise: Use hotel internet to download password Database.
MyTaxy, Uber, Cabify and Choofer - Usefull to ask a ride to back to hotel after a long night/day. For these last apps, normally you can make your first run for free or with a really nice discount. Advise: DO NOT let the install for last time, because they need focus and attention, to verify your account and add a PAYPAL or CCARD, as a payment mode, so if already have to much alcoohol to be worked by your kidneys, you probably will not be able to create an account.
I will leave my Referral code here, because when you create an account and use a referral code, you receive a bonus to use in your first run.
Enjoy your stay