We stayed in this apartment for 11 nights and also worked from there during this time. Therefore, good WiFi was a prerequisite for us and we had absolutely no issues, so I can definitely recommend this as a home office location away from home.
The apartment is really cute and cozy, however, for that amount of time for four people, we found it slightly small. Absolutely great spot for a few days but for a longer stay I would look for something a bit bigger and with a balcony/terrace to have some extra space and the opportunity to sit outside.
The location is really great. It is within walking distance of many great spots, there is a tram stop around the corner, and the e-scooters are also a good way to get around.
The communication with the hosts was absolutely superb - they opened a WhatsApp group before we arrived and sent over check-in information and a guide of Lisbon. They answered immediately whenever we had a question or needed something. Keep this up, guys! :)