リスボンの交通機関を利用するには、VIVACARD が必要です。 カードの料金は R$0.50 です。 カードを取得したら、1 回の旅行チケット、24 時間チケット、事前購入したチケットなど、必要なオプションをカードにロードできます。 あなたの場合は、24 時間オプションを選択してください。 ここがオリジナルのウェブサイトです。 詳細については、ページを翻訳してください。 カードをあまり使っていないので、あまりお役に立てず申し訳ありません。

Hi,
It doesn't matter if you to get in/out from Lisbon or Porto. I recommend as minimum stay, 2 days in Lisbon and 1 day in Porto.
If you are going to Sintra and Cabo da Roca with a local guide, better find a guide with car that can take you to Cabo da Roca and surrounding areas, which is worthwhile visiting. Else you will miss a lot of things and to come here for so little time and not make the most of it seems like a waste.
In Lisbon you can use Uber. that way you won't get ripped of. The metro works from 6:00h - 1:00h. So if you arrive at 23:30 I think you will be OK. As the last train leaves at 1:00h in the morning.

Hi,
I think if you can in Chiado, it is better, because there are a lot of restaurants, bars and nnightlife (Lisbon has a vibrant nightlife) within walking distance. Avenida doesn't have much going on. But you can always take the metro to downtown.
On the other hand if you want quiet and have restful nights, then Avenida is preferable, because depending on which part of the Chiado, it can be quite noisy.

Hi,
Lisbon has definitely more places to visit, although a lot of people prefer Porto's vibe. Porto is older, darker, has a more somber feel, Lisbon is more lively and also more sun.
I recommend as minimum 2 days in Lisbon and 1 day in Porto. Day 1 Lisbon downtown (Alfama, Castle, Chiado, Bairro Alto) and Belém area (a lot of monuments and the river). Day 2 Cascais, Cabo da Roca and of course Sintra. Porto you can basically visit all the must see places in a walking tour in 1 day. If you have a spare day in Porto, then I recommend a cruise along the river to see the Douro wine region.

I don't know what they will be asking, but a lot of people asks for a lawyer and/or solicitor to help with this matter, as the process is very bureaucratic and it usually takes a lot of time and they know all the ways to the process go smoothly.