Location is quite convenient, it takes ~10 min to get to the u-bahn or s-bahn stations. Also there's a bus stop nereby with TXL bus that can take you right to the city center.
Apartment itself matches the description. It has one king size bed and one sofa, both are comfortable for two people. Everything worked well except the shower - sometimes water randomly got cold for like a minute and then got back to normal.
The host (Thomas) was easy accessible via WhatsApp and responded immediately.
Summing up, we had a nice stay and can recommend this studio for 2 couples visiting Berlin (which is totally worth visiting btw:)