The apartment is great for a single traveler and located in a convenient, quiet area. Within walking distance to many historic sites and great restaurants. Just be sure to get confirmation of check-in time/instructions and the exact address of the flat in advance from the host who is managing the property remotely. Host communications needs much improvement as my calls/messages to confirm check-in time were not answered promptly within 24-48 hours of arrival to Lisbon.
Also, it wasn't until I arrived on the street of the flat when the cab driver and friendly locals pointed out to me that the host had not provided me a complete, accurate address. So, I had to scramble a bit to get in contact with the host with the help of nearby friendly business owners. Shout out to Helder, owner of the Fado bar/club down the street and Fernando of Fernandinho's restaurant. Please support their businesses if you do end up choosing to stay here! They were extremely generous and helpful.