i am new to record sexsounds, but not to hear them

1. apartments of my neighbors. There i can hear through a gap between door and floor or door case. They are very quiet, so i need a good mic. Here i think i need a cardioid mic?
2. on my balcony. There are sometimes opened windows, when my neighbors having fun. I thought that i can use here a parabolic mic?
3. around sound from the street where i live. Here is the voice recorder better?
4. hotels, what else. I think the best is to use the voice recorder?
I need a portable recording device which can record a long time. Thats why i wrote voice recorder. I think i take a voice recorder with mic in and can it use also without external mic. Is it right? I found some info about these olympus but some of these devices has no line in. Can you say which device is currently nice to have?
I have read the last 5 hours in the how-to and hardware forum, but find just old messages or nothing usefully. I want by my first equipment and will not pay money for unfunctional equip.
Are my considerations right or does i take the wrong way? Can you please give me some examples? The best is to get something from germany and not so expensive.
Thank you all.
maigo