I spent a month here in Feb / March and had a great time with many friends! The location is 10/10 and is near Marques de Pombal which has access to metro and buses. Getting to the Airbnb is cheap and easy via a bus or metro. Cafe Leitaria across the street is fantastic. So many restaurants nearby.
The internet was fast (100+ mbps download, 30+ mbps upload), definitely fast enough for large groups, and a room for private remote work which was ideal for my group. It’s important to note that the walls are thick, which limits wifi range and can be slow at the far side of the apartment.
The kitchen is well stocked with tools and supplies, as were the bathrooms, and bedrooms. We cooked often and had no issues. The listing and pictures were very accurate, and the team of hosts were very responsive. The apartment is on the first floor, but has no AC or central air. This is common in Lisbon due to the nice weather, and we learned quickly to crack the windows often to circulate the air.
Price wise, we paid a monthly rate, which made it easy to split with guests. There are cheaper options in the city, but the location, wifi, rooms, and kitchen I believe justifies the price. Good value. I highly suggest this place for large groups!