ᐅ Damp Basement - Window Replacement - What Should Be Considered?

Hello everyone,

I own a pre-war apartment (ground floor) that unfortunately has a damp basement.
The basement is not just a storage room, as is often the case in older or rental buildings, but more of a hobby room located beneath the actual apartment.

Unfortunately, one wall (street side – front garden in front of the house) is damp.
Because of the moisture, the old wooden window has been damaged to the point where it no longer closes securely. Therefore, it will be replaced with a plastic (PVC) window. In addition to replacing the window, the light well and the window lintel (steel beam) also need to be repaired.

In the long term, we are still coordinating with the property management to determine what measures will be necessary to make the walls more dry, as I would like to convert the basement into a usable space (workshop, laundry room, guest room, or similar).

Questions about the window replacement:
What is the correct sequence of work?
I was thinking: remove the old window, repair the light well and lintel, then install the new window. Is that correct?

What should be considered when choosing the window?
The material will be PVC. Wood and aluminum are excluded.
Due to the basement wall’s moisture, I would like the new window to provide some kind of ventilation, but without causing excessive heat loss. What do you think about systems like window rebate vents? Are these sufficient, or the right solution to control humidity throughout the year? I imagine that because of the dew point dropping on the walls during the summer months, I would probably have to keep the window closed then.

What else should be taken into account here?

Thanks for your help.