Vivi is a great host and her place is overall a remarkable place to stay. Starting with Vivi, she was super easy to communicate with and there at all times of our stay even if we did not meet in person.
Next the actual apartment is in a historical, but completely remodelled building. It is on the 4th floor with no elevator, which is perfectly common in Lisbon. Check in was great via internet controlled locks on the front door of the building and the actual apartment door. The space is well appointed with contemporary furniture that is comfortable & stylish. Only small suggestion would be to add some power bars in the living room and bedrooms for more power connectors. Internet is fast and wifi easy to connect to.
The bathrooms are super modern and very functional, as is the kitchen where Vivi provided many cooking necessities (oil, spices, sugar, etc... ) which is truly appreciated. The small espresso machine is Uber-cool and makes amazing coffee - I want one for my home :) Beds in all rooms are comfy and linens fresh/new. The living area has a large screen TV with all channels you'll need, a large couch and a nice table for serving snacks & drinks. It was amazing to have all this space for our stay and it is a wonderful apartment to come back to after exploring Lisbon.
The neighbourhood itself is just above the oldest parts of town, and it is an easy 5 min walk to two different subway stops. There are plenty of shops close by for food including a Pingo Doce less than 10 minutes and a very big super market Auchan in a modern mall approx 15 minutes. The area is very safe to travel to/from at any time. Uber lifts around the city never cost us more than 8 euros. The walk down from Vivi's place to the old town passes along one of Lisbons most interesting shopping streets, past the Botanical garden and many great restaurants.
In summary, you'll be hard pressed to find a better spot in Lisbon... enjoy Vivi's great location & hospitality!